I'd be okay with bringing him in on a minimum contract this summer.
Taking whose spot in the rotation?
Would Morrison get any minutes on the current Celtics?
If Ray Allen walks, I would hope we'd do better replacing him than bringing aboard Adam Morrison (assuming that Quisy would start and Morrison would take his place on the bench). That'd be a bigger downgrade than James Posey-to-Tony Allen.
Why would he be promised a spot in the rotation? If he earned it, he could be the backup SF, but why did you extrapolate a spot in the rotation for him? There are 15 players on the roster; he could just as easily be filling the Giddens, Tony, or Scal roles.
Meh, what's the point then? I mean, granted he's better than Giddens and TA, but I'm not exactly optimistic that he's ever going to turn into a rotation-caliber player. This isn't a case of a guy just needs to start hitting his jumper or he needs a little confidence boost. This is a player that coming out of college had known physical limitations that many people thought were going to severely limit his ability to play on the next level, and that has borne out completely true so far. Is he somehow going to become quick or strong enough to be a rotation player? What's his upside at this point?
If not, what's the point? I'd rather have someone on the bench who can play D, or someone that's got some upside.
Hell, I'd much rather re-sign Scal (shouldn't be that expensive) since he's shown that he can play some D, he can fill in at the 3 or the 4, and I trust his shot as much as I would trust Morrison's.
EDIT: The one skillset of Morrison's that should have translated to the NBA was the ability to drain the longball. He's a career 33.6% shooter; what's the league average, maybe 35%? What exactly would he bring to the ballclub?