Quartzsite snowbirds not here..Update They have arrived.

I think many younger folks just don't have the money. You need good jobs with security, union wages, pensions, etc to afford to travel and have leisure. Also a lot of folks are dying off or getting to old to travel that were in those kinds of jobs. It's a different world for many younger folks anymore.
DD and I came out last year, it was neat but nothing I would drive across the US to see annually. We are in Texas now and in March heading for Florida.