1)The Jazz do have the finances to to accommodate a core with Hill in it.
2)The Jazz would regress without Hill. Hayward would only need to look back to the previous season to believe that would be the case.
Why would we regress? Hill himself is setup to regress from his age.
The Jazz are better this year and Hill has certainly helped, but he isnt the only reason. Every single player on the team has improved. Every player should continue to improve next year, especially guys like Exum and Lyles. We are going to be a better team next year than this year, regardless of Hill's decision (assuming everyone else stays).