Hey if they're letting Ainge and Stevens go it's because they want to appease fans.
So I say, let's hire Paul Pierce as President of Basketball Ops.
Hire Scal as coach.
Perk as assistant coach.
If you can't be good at least be entertaining, right?
In seriousness, if Stevens resigns because it's not worth it to him anymore or something (in which case good for him), top of my list would be Dave Joerger. I think he did a good job in Memphis and Sacramento and ought to have another shot.
If you want to go "player coach" maybe bring in Sam Cassell or Ime Udoka.
As for GM, I assume that whenever Ainge decides to hang it up, we'll have Austin Ainge running the show.