I, too, grew up in a small Midwest town and have since lived in Miami, New York, and Silicon Valley. I guess you could say that I'm being insensitive, but I tend to see things a bit differently. Change is inevitable, and thinking that you can hold on to things forever is foolhardy at best. Yes, small town America has an ever so slightly different culture, and loosing it might be painful (much like loosing traditional print media, I should think). But I always think back to when I was 8. I had a stuffed toy animal that I loved and vowed never to give up. Then I realized that, while that stuffed animal represented a certain part of my life that I valued, it was time to move on. There will always be new things to value in the future.

Now, as for the issue you raise of language, at the risk of sounding hypocritical I must say I've always been a strong proponent of preserving dialects and less common languages. I think it ultimately comes down to a cost-benefit analysis. I don't think that small town America represents a culture unique enough, or hard enough to recreate, that it's worth extraordinary attempts to preserve it. Languages, on the other hand, often represent hundreds or thousands of years of collective cultural knowledge, and once that's gone, it's gone.

A last point I feel I should make: if there is some "intrinsic value" to small town America, I think attempting to preserve small towns by creating artificial incentives to keep headstrong youth from leaving would probably do as much or more to destroy that intrinsic value than just letting nature take its course, so to speak, and gradually reduce the number of small towns.