It depends of course... if he joins a team of which I don't like the playstyle or players then no. Same for FaZe, if they get a good player both in-game and personality wise, I'll probably keep supporting them. That being said, rain will remain my favorite player.
I do like GuardiaN, I like Karrigan and I don't particularly dislike NiKo or Olof. Their playstyle as a team has always been quite individual, even in G2/Kinguin days, if that playstyle were to persist through a roster change then I'd probably keep supporting.
If rain joined any decent team though, probably them.