I don't think Marcus would do that. He's going to get his money. I think a lot of teams want that type of energy. My guess: 4x$15m in Orlando or some other irrelevant franchise.
Regarding salary negotiations, I think Avery Bradley and Marcus Smart have and had similar market value. Bradley>offense, Smart>defense. Smart is a little bigger.
If Danny didn't want to pay Avery, I see no real reason that he will want to give Smart his market value. He's still dreaming big, and handing out good money to non stars won't help.