1) Yes I too agree with VoLTE + CDMA devices, I'm hoping my current iPhone 6 will be one of the first!2) The thing is if you compare Sprint's PCS based CDMA network to band 26, in theory everything should be covered so density wouldn't be needed except for department stores, malls, and Walmart due to poor penetration still. If you also consider 1x800 however, we do need much more density and coverage, but that's where 600MHz comes in, small cells for this year, and hopefully new macro sites.
Unfortunately, only new macro sites we'll see this year will be in Montana and rural states.