If it were up to me, no way I'd mortgage everything for AD. You're basically giving up every asset that could improve the franchise long-term to acquire an essentially fixed team of Hayward, AD, Kyrie, and an aging Horford. If that core isn't good enough to beat GSW, and it may very well not be, then you're stuck, with a luxury tax the owners won't pay for long, and no assets left to get you over the hump. The same position Cleveland is in now. You'd have taken the very long window we have now and reduced it to a few years. I hope that isn't what Ainge is depending on.
If Ainge isn't good enough to take advantage and turn the young talent and high draft picks into star players, and Brad isn't coach enough to develop those young players, then we have the wrong men in charge.
Frankly, I have little interest in trying to win a title by piecing together a team full of other teams players and squeak another one out like we did a decade ago. There is no substitute for having a core of young stars who can stay together for a decade. 5 years down the road when guys like Bagley and Porter and Tatum and Brown are stars, we'd be left with an old, overpaid roster and in dire need of a rebuild.
If it involves giving up Tatum/Brown and our good #1s, no thanks.