I wouldn't use a stretch provision, it's better to bite a bigger bullet short term than have a lingering 3 - 5 mil on the books for the next 5 years. I'd probably be more willing to dump my 1st this year to move Exum's contract if I was the Jazz and wanted to cut ties with him in the offseason, as you can also save money by not having to pay a rookie scale contract as well if saving $$$ is the priority.
But I'm not that high on this years draft outside of Zion + a couple of others so I'm content to not have a pick this year.