I think Avery Bradley will have to go at some point in the future but I would keep him for now because I do not like Isaiah Thomas as a starter (he is a bench guard) and because I think Rozier should be brought along slowly.
I think Bradley and Smart have too many similarities and limitations offensively to survive together long term. That is the reason why I think Bradley will be need to go at some point. But I keep Bradley for now because nobody else is well suited & ready to replacing him as starting SG.
I'm OK with starting Rozier and Smart together, or alternatively starting IT and using Rozier as the 3rd guard, because I'm not worried about competing next year.
This roster is asking for a re-shuffle. It's clear a quick fix is not on the way.
Unload Bradley and Turner, re-sign Crowder only if the price is right, let Jerebko and Bass walk, look into signing a free agent center if the right one is available (Monroe is the ideal, Koufos is a good backup plan).
Then let's find out what we have with Rozier, Smart, Hunter, Young, and Crowder. What sort of a role can these guys carve out on this team, and will they succeed or fail with larger roles?
I'd move on from Sullinger, too, if I could. Olynyk, Zeller, Mickey, and Monroe / Koufos / FA Center would be a decent 4 man rotation to work with.