The Jazz are NOT going to sign and trade Hayward is that scenario. They would just dare Hayward to leave for a SIGFICANTLY lower salary. They know he wouldn't.
This situation if different than the James situation. In that case, Miami had max space and James would have signed for it. In the end, he got a little more money with the sign and trade and Cleveland got something, which is better than nothing.
PLUS, George isn't going to sign and extension right now when he can get much more after next year.