I see this as this season. Next season, it will be Pierce. The following season, it will be KG.
Now, if Ray can be moved for a younger star (like Martin) then it works.
But if Ray get traded for a poo-poo platter of nice players that are overpayed for multiple seasons (like Hinrich and Salmons), it is bad.
It also compounds in the NBA.
Let me give you the example. The NY Knicks.
The Knicks did the same thing with Patrick Ewing. They trade him in his last year for the poo poo platter. Then they kept trading different parts off the poo platter for more poo poo platters. It snowballed. Finally, this season, they may be finally getting free of the avalanch.
Is this what we want to see happen with the Celtics?
So unless there is that Ray for a star trade, Celtics should play this season out with him and let the chips fall where they fall. Sure, make minor bench trades, but see what this team has left.
If the Celtics are successfull (title or bust) bring Ray back for a two year deal (to end with KG).
If it fails, let Allen go. Start thinking about trading KG for youth, draft picks, and cap space. Start the rebuilding.