I really can't disagree with anything you've said. It's nice to find someone with similar interests.
I'd emphasize, though, that if you're only looking to establish transit routes around the population centres for those low-density counties (which is the optimal way to do it), your ridership market will end up being lower than the 60,000 people you talked about. I haven't gone county-by-county though, so you're probably better informed on the specifics than I am. I'm not sure how many counties on your list are right at the 60,000 mark.
Anyhow, best of luck. TOD has the potential to solve a lot of regional problems. If you ever want to talk about it more, let me know. I love this stuff.