Why would Utah do this? Dante Exum's potential could very well surpass what Bradley is as an NBA player right now if he pans out. In one year, he showed he's already a better passer than Bradley. He also showed flashes that he can play good defense. He's just 20, in two years time he could easily develop into a really good two way player. And you're asking Utah to give up on him in his 2nd year, when he's still 20 years old, just because he had an ACL tear?
Nerlens Noel tore his ACL and came back very well, it's safe to say that Exum can come back as strong. That injury won't be the reason the Jazz will not only sell low, but will completely give up on a high draft pick just a year after his rookie season.
And who says Utah is on win now mode? They have a great future, so they're probably not as concerned as competing now. Favors is 24, Hayward is 25, Rodney Hood is 22, Rudy Gobert is 23. You add Exum to that and Utah will have a great starting 5 who's still relatively young in 2-3 years. While they could probably win some games with that talent, they will definitely not mortgage the future of that young core for Avery Bradley. I mean, if they really are on win now, surely they could get a lot more for Exum than just Avery Bradley, even with the ACL tear.