Well, there’s a question of how exactly are they going to do this.
XMPP? Everybody who had XMPP has dropped it. It’s not at all obsolete, but the fact is that companies don’t like it.
Closed federation between friends with some proprietary protocol (possible with XMPP too, though)? Well, so I’ll be able to write to WhatsApp users from Facebook Messenger or Viber. Doesn’t change much, TBF.
I mean, I can imagine them setting something up for identities and private messages from them going back and forth. But practically important features would likely still be locked.
Possible if they respect your opinion, not really if you are a weird guy with a disorder whom they like, but are not going to take as a tech authority or something.
I already had this with recommending Linux (and other Unix-like OSes). All my attempts to even talk about it were taken with zero understanding, but once another person tried Fedora and liked it, this started spreading like a virus.