It's not complete insanity to think Kyrie might head to go play with Butler somewhere. They are clearly best bros and Butler has already turned down an extension with the TWolves.
I know C's fans are super defensive and protective about this but it's not like Kyrie has any ties to Boston. He's played a single season here and not even the playoffs. I guess fans just like the idea of having a "superstar" in Boston, but it's not 100% he's staying, which is fine.
C's can draft someone like Reddish to take the lead guard spot in the future and extend Scary Terry. It's not the end of the world if he leaves..