DDR will be 32 next season. Of course he will be looking for his last big contract. They all do, around his age. What he'll end up with, nobody knows yet.
For the point you're apparently trying to argue, LMA is a much better example than Rudy. LMA is on the second year of a 2yr deal. LMA will turn 36 next July. Presumably, there was mutual agreement for a shorter deal - shorter than the 4yr deal that LMA first signed with the Spurs - because LMA is probably near retirement.
Anyway, my preference is to let DDR leave. The younger players should develop to replace him adequately, and more, with their 3pt shooting, and better defense.
LMA is the one who's hard to replace, with his size and scoring ability. The Spurs' money, formerly spent on DDR, would be better spent in the power forward area, in the future.
Oh, don't get snippy just because someone is arguing with you on an internet forum.