The reality is that getting AD for a rental might be the only way you keep Kyrie here. So if you are Danny you have 3 choices:
1) Wait until the offseason, pull the trigger on the AD trade (even if it includes Tatum), re-sign Kyrie, and hope those two bring you Banner 19 and that entices AD to sign long term. Even if he leaves, your consolation prize is a championships. But you must win the ring
2) Punt on AD. Try to sign Kyrie, and if he decides to walk away run it back with the remaining core, which still could be the #1 team in the East, but is probably worse off.
3) Trade Kyrie now to get something back for him if you think he really is going to leave.
Option #3 is extremely unlikely because even if Kyrie was 50/50 to re-sign, trading him now would be a huge gamble on the remaining roster and now you are definitely out of the AD sweepstakes in the summer as adding him without Kyrie makes no sense.
Option #1 is becoming increasingly less likely as Rich Paul's assault on Boston at the very least has to make you concerned that AD would not re-sign here, even with a championship, and that puts a ton of pressure on the 2019 team to win it all because your team is gutted beyond that.
That's why #2 is the likely scenario, as Kyrie is till probably at least a 50% chance to re-sign even without a Finals appearance this years, and I would guess that making the Finals is a lock he re-signs.