It does not have to an all-or-nothing proposition. Do it in stages.
Try this: first get yourself to use it with a few friends. See for yourself what use cases work well and what use cases don't. Bonus points if you collect this feedback and give to the team. Bring your close contacts to use it and try to make your default app, but don't beat yourself or swear it off when you can.
Upon new release, try the use cases that were failing and see what progress has been made.
Best case, you end up realizing that the new system is not as bad as you thought and you are ready to jump out of a shitty locked-in network. Worst case you spent some time learning about a free system and you are more informed and able to help those that know of no alternative and think that being spied on and manipulated is just a given.
No, we can't. Because the time aspect matters, and if you want people to switch now, the client has to be polished now, not "when it's done". And right now, it's a mess.