I may have exaggerated a bit when I said Manu hadn't really performed, but I see no reason to believe that he will have better production, fewer injuries or be able to play more minutes in the coming 2 years.
His injuries this year have been the most worrying. They haven't been accidents like turning an ankle or from collisions, they have been things like back spasms and pulling a hamstring when there is nobody around. Those are the kind of injuries you get as a player gets older and they will keep coming.
If Manu had delivered 14 and 5 and played a full 82 game season I would agree he is easily worth the $8m people are suggesting, but the fact is he can't play 82 games and going forward that is only going to get worse rather than better. Factor in the games he will miss, the games he will underperform when coming back from injury and the likely need to reduce his minutes even further, I think $5m/year is about what he is worth.
Again like I say if he get's $8m I won't be mad, he probably deserves even more than that for what he has done for the Spurs over the years, but I don't think he is worth that much in terms of what he can give us over an 82 game season.