I don’t think it is about building the land of the goyim and turning one’s back on kedusha, loving galus or turning our cities into Jerusalem.
OOT Jews living in small communities among a goyish majority probably feel that they are in galus much more than the average Jew living in a frum enclave in BoroPark or Lakewood. By leaving the established communities, If anything they are showing that that the greater NY area is not the new Jerusalem.
besides, leaving/being forced out of established communities and having to build new ones has been a trend that is typical of our long galus.
If it was only so simple for everyone to move to E”Y. Parnassa is a real issue- how many Americans are telecommuting and spending significant chunks of time working away from their families? How many are stuck in low-paying entry level jobs that do not cover their expenses because they cannot break their way into the Israeli employment scene? Chinuch is a real issue- for anyone with older kids (usually set as 10) it is quite hard to get used to a new schools system/culture and most chinuch experts would advise you that it would be a disaster for them to make aliya.
Yes, EY is like no other place, there is kedusha and Torah and it is our Home. But we do not have the Beis Hamikdash, the shechina is in galus and Israeli society and government are far from ideal. EY as it is today is a mere shadow of what it should be. I think there may be a greater danger for a Jew in EY to forget this than one living in Norfolk.