Absolutely not. Not only won't it happen, it shouldn't happen.
We have a project center in Melo; we don't need a second. And as others have said, Collins will have value. Not only will he be valuable against the likes of Howard and Bynum, he's also valuable in his ability to handle inconsistent minutes. I'm not sure a young player can handle that.
Plus, Downs, at best, is a guy whose upside is a fringe rotation player. On a contending team, you don't cut a potentially valuable bench player in the interest of someone with that kind of upside.
This makes sense. Truth is, though, we have more than one project player already (Sully, Joseph etc.), and again I cannot believe folks here are legitimately spouting this "Dwight Howard Stopper" stuff. KG or Darko will have to be our Dwight Stoppers, and I believe in both of them much more than I do Collins.
I guess I'm not seeing the value in Collins that others here do, and I'd love nothing more than to be proven wrong, but I think even with the inexperience and unproven game Downs brings more to a position of greater need. Anyway, glad I don't have to make these decisions, and WHEN Collins is on the floor in a Celtics uniform, I will root like hell for him.
I figure you can always cut Downs later on and make a run at Birdman or the like if you value bigs over 3s, but I'd rather have the bodies behind all positions for insurance. We are so thin at SF that we cannot afford any injuries, never a good sign...
I wont like it though...