Tengen31

Impossible at the moment.

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Yes. That is not low/midband spectrum as I said. 

Dish has very clearly expressed that they want to do something with their spectrum. Buildout deadlines have passed and been extended. They likely will not be extended again.
If the merger falls through and Dish's options are to partner with an existing carrier or to build a network from scratch and try to compete on a national scale, I think they would choose the former. This market is one of economies of scale and enormous barriers to entry. If Dish were to try to build a network from scratch, they wouldn't see profit for years and years. And even after this time, ROI isn't guaranteed. 
T-Mobile isn't as interested in smaller chunks of low/midband spectrum as they already have enough. What they need is large swaths of highband for NR. This is probably their biggest motivation for the merger. Dish can’t help them there.
AT&T has more spectrum than they can put on air, and isn't looking for more. They have B14 and B66 that hasn't been deployed across half, if not more of the nation.
Verizon has repeatedly stated that they are perfectly happy with their current low/midband spectrum holdings. If they wanted to bid on 600 MHz spectrum, they could and would have. 
This leaves Sprint, who I think could benefit a lot from Dish's spectrum holdings. 

Or they could get in bed with Dish. Dish's 600 holdings are 5x5 nationwide with larger holdings in major metros. 
http://maps.spectrumgateway.com/dish-600-mhz.html
Working with Dish would also get them:

• 6 MHz 700 E Block (722-728) (This can likely be traded/sold to AT&T)
• 15 MHz AWS-3 (1695-1710)
• 10 MHz PCS-H (1915-1920, 1995-2000) (I wonder if some DSS magic could be done here to allow for a PCS C+G+H NR carrier)
• 40 MHz AWS-4 (2000-2020, 2180-2200) (Sprint can petition for LTE band 23 to be standardized for NR in order to use this spectrum)

Or they could get in bed with Dish. Dish's 600 holdings are 5x5 nationwide with larger holdings in major metros. 

http://maps.spectrumgateway.com/dish-600-mhz.html

Working with Dish would also get them:

• 6 MHz 700 E Block (722-728) (this can likely be traded/sold to AT&T)
• 15 MHz AWS-3 (1695-1710)
• 10 MHz PCS-H (1915-1920, 1995-2000) (I wonder if some DSS magic could be done here to allow for a PCS C+G+H NR carrier)
• 40 MHz AWS-4 (2000-2020, 2180-2200) 

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Could buy it off of Dish only in areas they need it initially and start a slow 600MHz rollout.

Nope. Just the 15x15 C4+C5+G carrier right now. 
Sprint doesn't own any PCS A block spectrum in San Diego. The A block is wholly owned by AT&T. 

I think if Sprint’s 5G deployment continues to go well, they’ll be able to buy themselves some time to figure out how to make a comeback. 

Looks like Illinois jumping on the train to block the merger. I’m sure what comes with this is people saying “if the merger is blocked, Sprint will be out of business and their assets sold to other companies.” Everyone is just completely looking past T-Mobile stopping their 5G deployment all together. To me, that looks like a money issue if you ask me especially if it’s suppose to be BAU until the merger closes. 
 
 
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San Diego has 15x15 L1900.
 

The upload speeds weren’t terrible. They must’ve had upload CA enabled. I did see 31Mbps up on what must’ve been that newly widened 15x15 band 25. It was wonderful!

I was pleasantly surprised with Sprint’s performance in my recent short trip to San Diego. Inside the airport is still terrible to ok but outside the airport and around Pacific Beach was very good. I was extremely disappointed with Verizons service in Pacific Beach. Severe congestion led to the inability to break 2Mbps down.
Here is a summary of my tests from this recent trip:
Sprint Average DL: 57.75Mbps
Verizon Average DL: 42.66Mbps
Sprint Average UL: 8.07Mbps
Verizon Average UL: 12.57Mbps
 
Verizon’s average speeds were bolstered by excellent performance at the airport. Sprint’s fastest download speed was 149Mbps while out and about in Pacific Beach. Verizon’s fastest download was 123Mbps inside the airport at gate 36. This isn’t exactly scientific as these were the averages of only 7 tests so take it as you will. 

I thought  roaming on T-Mobile would help but I’m not sure if the merger will help met at all now

Yeah, I don't think any of the older model will ever be compatible with Sprint in its current form (Sans merger)

Merger close?... It's a big wild guess!   Nothing has gone as it should nor does it continue to go as normal.    

No coverage from what I've heard.

T-Mobile is congestion city combined with poor coverage.

There are very few Sprint customers here. This is proven by the fact that I get consistently good speeds on 10x5 band 25. 

Verizon has terrible congestion issues if you aren’t on a small cell or mini macro. If you’re on a small cell or mini macro it’s great.

It does support BC10: https://fcc.report/FCC-ID/2ABZ2-GM1925

No one else to switch to that's good. 

Here in Western Washington the 3x3 B26 LTE carrier works better than Sprint's 5x5 in most markets.  The key is having a robust network on other bands, good density and aggressive band switching when other bands are available.  Samsung and Sprint have nailed it here.  One of the best markets in the country.
Robert

I strongly agree with Robert. Good equipment (high gain antennas/high quality diplexers), good band management, good density and good network config can make a 3x3 carrier perform better than a 5x5 or even 10x10 carrier. I would take Sprint's 3x3 L800 in Seattle over Verizon's 10x10 L750 or T-Mobile's 5x5 L700 any day of the week. 

I strongly agree with Robert. Good equipment (high gain antennas/high quality diplexers), good band management, good density and good network config can make a 3x3 carrier perform better than a 5x5 or even 10x10 carrier. I would take Sprint's 3x3 L800 in Seattle over Verizon's 10x10 L750 or T-Mobile's 5x5 L700 any day of the week. 

It should help in my Grandparents area where T-Mobile only has 30MHz for LTE and Sprint has 40MHz for LTE.