Rondo runs two big risks outside of injury in not getting a deal done.
The first is simply he does not get better, his production does not improve or worse declines. Not really expecting his scoring to improve we just added Wallace and KG back tough to rebound more and he has shown no signs of fixing his FT shooting. Before you say can't happen look at Perk the year after he got his contract.
The second is that next week you are a Golden State Warrior learning how to be Nellies PF in this 6'3" under line up, or a Grizzy or a Clipper.
If you don't think it could happen ask Antoine Walker.
Perk was injured that year, wasn't he?
Rondo's shown strong improvement each year. All the talk about him hitting a plateau before he's 24 seems a little silly.
As far as Perk he played more games than the year before his production just dropped off some.
As far as Rondo's improvement, he is a better player sure but I don't think his production has improved that much over the last two years. Everyone makes a big deal about the post season production but forget how many more mins were played because of the overtimes. Per 36 in the postseason Rondo was more like 14.7/8.5/8.5 still great but not as eye popping and now it is going to be KG and Wallace instead of Big Baby and Moore he becomes lucky to grab 5 boards a game. The assists are what they are he could get 7 he could get 10 it is subjective but I don't think he is getting more shots in this offense so unless he fixes the FT's or starts taking and making 3's he is going to score 11-12 points. You are looking at 12/5/8 just like last season.
As far as contracts go Aldridge got essentially the same deal as Big Al 5 years 65 mil. Roy got the max of 5 years a little over 80 mil. Now Bargnani who is not my favorite player but is a 7' who can shoot the 3 and avg 15/7 as well as the former #1 pick got 5 for 50.
Based on his production Rondo is an 8-10 mil player. Offensively probably 8 and you add in the defense and playing on a winner and he is likely worth 10 a year. The problem going forward with a guy like Rondo at that much or even more money is that you still have to go get the 20 ppg scorer. Even the most one dimensional of those guys still cost 10 mil a season. This is a long term contract in terms of this present team they could just do nothing with Rondo he is here this year and they could just force him to make his way and get a sheet and tell everyone they will match and then look to deal him away when they rebuild. But it might have more long term value to move him for something that has move value.