it's that he really seems to have made a bad decision.
I don't concur with this.
For Ray, it was an ok decision. Here's why ...
The man's 37, not 34. From here till 40, any slight accident or injury could render much of his SG game into no man's land. And unfortunately, given the way the game is played, it can happen rather easily when overplayed.
With the above in mind, if he stayed on the Cs or move on to ChiTown, the chances are that he'll play a lot of minutes, with the notion, since Rivers/Thibs have total confidence in him, that he'll carry the team on a barrage of 3 pointers a/o 18-20 footers.
I think it's quite the opposite now. Ray Allen is basically turning into the past 35 year old Robert Horry of the Spurs. When he's fully rested, he can hit the money ball in the fourth quarter or whenever Miami's got its opponent over the team foul limit, Allen can cap off the game from the free throw line. That's basically a game of 10 to 15 mins per contest and even at the age of 39, Allen can do that without many issues.
Thus, it's an easier job to help segway into a more permanent retirement. And I suspect that if he's injury free, then Riley may even extend his contract into his early forties.