As someone who just discovered a bike club last year I have to say that if the club ever disappeared I'd be sad.
We offer 3-4 rides each day across my city. If you want to ride, you can just go to a ride start, sign up, and go for a ride. It's so unbelievably convenient, and there's no messing around with stuff like facebook. It's also great for out-of-towners trying to satisfy the addiction. I can't tell you how many times we've had someone visiting family for a few days come to a ride and just... well... ride!
Clubs aren't irrelevant. They're very relevant.