I think that there is a lot of loshon horah said here about the Upper West Side. It is a vibrant place for many thousands of jews, there are shtieblech and mikves and there are places for every one. To say that by moving to the UWS, one sheds one’s religion is ridiculous. If anyone goes “off the derech’ it has more to do with someone’s own inclinations than with the UWS.
BTW- wearing jeans (to MorahRach) is not the worst thing to happen to someone,albeit it is a kulah that will not be acceptable in Boro park.