My point was not what I could do but rather what I will do to try out some random new social network. Having now read that migrating identities is currently impractical I am even more certainly not going to take a chance on some other random server or even my own!

How well has federation worked out in practice (for other federated, social network related protocols) so far?

As far as I know, federation has only worked for ancient stuff that has nothing to do with social networks, like email and DNS. Basically, it is a part of core functionality and thus can't be co-opted by commercial interests (though GMail has made quite an inroad!).

Until it has proven itself, social federation doesn't really seem like a strength to me. It does sound good in theory! Other people with actual experience are adding their anecdotes which lines up with what I'm trying to say.