The following scenario features a lot of what ifs and my intent is not to debate Irving's free agency, Al taking his player option, what Rozier is worth as a FA, or potential draft picks.
The question is how would you feel about this roster for next season and the future.
Starters
Smart
Brown
Tatum
Hayward
Horford
Key bench players
Rozier
MLE FA
Semi
Williams
This roster would likely be a gut punch for the fans who have visions of an Irving / AD future.
My thoughts are that while this team will clearly feel the loss of Irving's talent and missing out on AD will be a major blow we still could be left with a good on court product. I suspect this team would have good chemistry given that each player would have a clear defined role.
Starters
Tatum would obviously have to carry a much greater role on offense and I suspect this leads to his first all star season and a 20+ ppg scoring average. Hayward would be asked to play a much more prominent role. This coupled with anther year removed from his injury would hopefully give the Cs a player that better resemble UTAH Hayward. Brown is likely the greatest benefactor as he would become the clear 3rd option and I suspect we see the 2017/18 playoff Jaylen reemerge. Smart and Horford wouldn't likely see little change in terms or their roles.
Bench
If Rozier is retained for a reasonable contract and given a clear 25+ mpg 6th man role I would expect a player much closer to last years playoffs then his current production. Semi player a greater role and Williams earning a role would help revive the Cs identity as a tough defensive team.
Depending on how Free Agency effects the east I would still suspect this lineup to be a top 4-5 team in the east capable of playing with anyone on any given night.