But now imagine a long running open game where people play multiple times a week...
what-What-WHAT?
Very few people have this "no other responsibilities" type of lifestyle. Probably why nobody else shares your "concerns" about this. Consider yourself a pioneer, send us a message from Planet XP-5000 when you get there.
On a personal note, even if I could play more than once every two weeks, I wouldn't do it. There are too many other awesome things to do in life.