fandoms as old boyfriends

I think this was a meme, back in the days of yore.

( Pokemon, QaF(us), The Sentinel, one-off fandoms, SGA, Inception. )

The only thing is that - can fandoms be husband material? Does it work like that? Aren't fandoms, by their very nature, transitory things? Can anyone say that they've been in fandom X for twenty years straight? Because I've always been the marrying sort, about pretty much everything. I want to stay forever in places where I'm happy.