I would be fine with moving KG to get out of his contract. He will be extremely overpaid in the season after the next one. If we feel we don't have a chance to win it all next year, seems reasonable.
We might have been better off NOT extending KG when we traded for him, and waiting instead. He would have wanted to re-sign anyway and we might have had him for less $$ due to injury.
I don't about the year after next part. I think aging is hard to predict if we're talking about one year apart.....If the Celts have an off year sort of year next year, little playoff actio, for example, he could very well come back stronger for his final year. It's conceivable to me that of this year, next year and last, last could end up the best. (I'm rating this year pretty low and still thought he helped a lot). Of course, if the Celts either wear themselves out next year or just start really sucking, then KG would probably traded at some point before or during his final year..
Agree with your above post. There are teams in the West that Kevin can probably help now even more than the Celtics....Salary-wise maybe just the team's you listed. they would just need to gamble a bit on his health.