It also seems to me that there is a progressive quality to this process, in the sense that it has a tendency to build more and more momentum behind it. Let’s say you are born in Omaha, Nebraska, and you like to think about movies, and hang out with other people who like to discuss movies. If no one could ever leave Omaha, then you and all of the other people from Omaha who happen to be movie fans could hang out and talk about movies. But now, some of those folks are going to leave Omaha and movie to LA to hang out with movie stars. This makes it harder for you, as a movie fan, to stay in Omaha, since there are now fewer people to talk movies with. Even if you would just assume stay in Omaha, the fact that other people leave makes it more likely that you too will leave.
Once you decide to leave, it makes sense that you are going to want your new destination to be exactly the way you imagine it—after all, moving is no fun, and you need a pay-off to make it worthwhile. So, why spend some of your time around movie fans when you can spend all of your time around movie fans? If mobility, whether actually physical mobility or the ability to communicate across distances with the Internet, allows you to make a community that is exactly the way you want, why participate in one that is only kind of what you want?
After all, Ave Maria’s existence is premised on the fact that there are a critical mass of people who a) have head that there is this place in Florida where everyone is a conservative Catholic, and b) are capable of picking up stakes and moving to Southwest Florida. Both of those things are not possible 100 years ago, and are probably not really possible 40 years ago.