I think there was a thread about Hayward a few weeks ago. Utah is not giving him up because he's young, he wants to be there, they have plenty of cap space, and they've been rebuilding for awhile now. Even if they wanted to tank, their current record is already bad enough to accomplish that just fine. The time to target him may be after next season, because he has a player option for 2017/2018. If he makes noise about wanting to play for a winner, Utah may worry that he will bolt.
If he were actually available now, the Celtics would jump on him in a second. There's a difference between giving Green, who's already 28 years old, 12-14 million a year and Hayward, who's 24, a max deal (4 years/62 million). For a rebuilding team/rising team, Hayward is ideal. Green is a better fit for a team ready to win now.
I'll also be Debbie Downer again and repeat what I said in that thread - Utah is keeping Favors, Hayward, and Gobert going forward. The young player they'd be willing to deal/lose in RFA is Kanter. Everybody's bone just went down.