I doubt there'd be any refusal to move Vasquez if another team requested him in a trade, although I'd be quite surprised if another team requests him in a package.
Just thinking about Cuz/MLM and a top pick this June, we're putting our core together and I don't see Vasquez being a part of that core at all. Tough to tell if PDA would try to resign him or not. We'll have to wait and see. But as our core grows together getting a solid starting PG will be very important. And with Malone's defensive philosophy, if Mac did become a great defender I still don't think the backcourt being what I'd term as "barely acceptable" would be acceptable to Malone. At least I hope not. But I don't like Vasquez on the offensive end either. Poor understanding of creating shots for and going to our shooters. Outside the occasional lob there isn't much there.