As with any other credential, a college degree was only a ticket to higher earnings and a middle class lifestyle in so far as it gave it's holder an advantage over their labor market competition. If most people get a college degree it ceases to be an advantage that can confer higher earning potential. Of course, there are still some degrees that can do that just not any college degree as it use to be.

I don't think BTC will exceed 100,000. It's in Trump bubble right now and will likely drop back to pre-election baseline.