Fair enough, but I don't know that it only has to do with population. They've done areas around the country that are pretty low in population.
Nobody knows when the upgrades are coming for Network Vision, but the ones that are on Sprint's Network site are just normal upgrades, they're not part of NV. I'm in the same boat as you are at work in Gahanna. Though my ping isn't quite that bad. I usually get about 200 ms but download and upload speeds are about the same. I think the main problem is capacity around here, I'm where a bunch of corporate offices are so a lot of people are using data during the day.