Vidal is one of my favourite players in the squad right now, probably my favourite after Buffon. But he's not one of the most important per say. He's 28, his style is one the wears on the body very much. And this recent behaviour is not of Juve material at all, this is something you would expect from a Barca or RM primadonna. By selling him, we can bring in ALOT of money for important positions that need enforcing, and we may even be able to keep Pogba, someone who's younger, has a much higher ceiling, and already has the biggest marketability of anyone on our squad by a longshot.
I would hate to see him go, I love him. But if Bayern offer the right price (60-70mil), then I can't see why not.