People want to be in a place with common similar beliefs - this isn't a bad thing, its human nature. Its far safer to be around people you know don't like to eat people like you.
The main argument seems to be that because we're not having forced arguments and considerations in meatspace, mano-a-mano, we're not challenged enough. I'd argue we're extremely challenged nowadays, but most of the difficulty is in finding how to deal with the new stage upon with the game is set. Its like arguing that we've lost the ability to form up a cavalry line because of the airplane. You're right in a way, but its irrelevant. The game is changing, and everyone is scrambling to figure out what the new meta is.