Well, we probably agree that strictly as a player, #44 doesn't get retired in honor of Danny Ainge. Right?
As a GM, he's put together exactly one title-level core that will hopefully win at least two, hopefully 3+ banners.
Funny that nobody has yet posted any sort of standard or criteria for getting up to the rafters as a non-player? We can sort of get a feel for a standard for players by who is already up there. Could we do the same for a non-player? There is only Walter Brown and Red Auerbach up there as non-players. My gut says that to come close to making a "Red Auerbach" standard as a non-player, a person would have to do one or more of several things (that may not be possible in the current era):
1) completely revolutionize the way a team is made, a la inventing the idea of 6th man.
2) Coach the team to more consecutive championships than has ever occurred (or likely will) in any professional sport.
3) As GM, build and completely rebuild the roster to create championship winning teams with completely different cores in three different decades.
I'd say talk of raising Danny to the rafters is a little premature. Putting one title-level core together one time doesn't cut it, even when coupled with being a solid starting-caliber role player on two title teams.
If he rebuilds the team and banners are raised post-KG, then the discussion is warranted.
If he rebuilds the team and yet More Banners are raised post-Rondo era, then I'd probably sew the thing together myself.