@a1ba @Gargron IIRC what Google did is make people migrate en masse to Google Talk, for various reasons but a lot of them even made technical sense due to XMPP's pretty poor interoperability on almost all levels and the particular case of VoIP being an horrible pain to get working thanks to NAT.

Meanwhile in this particular case:
- I don't believe people will move to Facebook's servers
- Facebook has been leaking users for the past years, so I believe people *will* leave Facebook, specially if they can still contact some people after migrating to the other side
- The fediverse bootstrapped itself / works standalone, it's not the extraneous network like it was in GnuSocial era where basically everyone had accounts on a bigger network