He's a 4 time allstar, but he's limited in certain areas and not a "superstar" like LeBron, Durant... or Kobe, Duncan and KG in their prime. He's coming off a major injury and will have a ton of competition in the coming years. Does he continue to make the all-star game when D-Rose gets back?... In the East alone there is Holiday, Wall (22 on the rise), Rose, Irving, Deron Williams.
Maybe.
I see him as a Chaucey Billups type (5 straight all-star appearances). Good player... can be a key part of a title team if he's surrounded by other great players. BUt you wouldn't have built a franchise around Chauncey Billups. And building a team around Rondo doesn't make sense.
After KG and Pierce leave... this team will no longer be a contender. That's a fact. It's not even a contender now with them... we're a 7th seed team and we might get thrashed in round 1. To win a championship you need an elite big man and an elite scorer. Generally every champion has a top 5 player. Rondo is definitely not on that level. He might not even be a top 5 point guard after this season.
So how do you become a contender again? Well, you can try desperately to land a top 5 player. Chris Paul and Howard might qualify... they are both unrestricted free agents, but we don't have cap space and they aren't going anywhere. LeBron is a free agent in 2014... good luck with that.
Who in the league right now is likely to reach that level? Maybe Irving? Maybe Anthony Davis. I can't see Boston landing either.
I'm hearing a ton of people saying that Andrew Wiggins (currently in High school) is the greatest prospect since LeBron James... which is saying something, because Kevin Durant was as can't-miss as a prospect gets.
So what i'm saying is... the bottom line is that the most likely scenario of us landing a top 5 player (and becoming a contender) is tanking next season and lucking into Andrew Wiggins. The odds are severely limited. But you have 0% chance of getting Durant. You have 0% chance of getting LeBron. You have 0% chance of getting Irving. You have 0% chance of getting Anthony Davis. If we had one of the 5 worst records in the league, we'd have a 10% chance of landing Wiggins. It's tiny, but it's more than anything else.
That's your best and only option for building a contender. So say we managed to tank... say we managed to luck into Andrew Wiggins. Say we managed to do all of this while holding onto Rajon Rondo. Rondo would be 29 years old Wiggins rookie year.
If Wiggins follows the same developmental path as Durant, the Celtics wouldn't be a playoff team again until his 3rd season... Rondo would be 31 years old. If Wiggins follows the same developmental path as Durant, they wouldn't be a serious contender until his 5th year.. by then Wiggins would be 24 and Rondo would be 33 years old and on his way out. I'd rather have other young players to surround Wiggins with.
You could also just wait for Kyrie Irving and Anthony Davis to become free agents. If they hit free agency at all, it will not be for another 5 or 6 years.
TL;DR: Rondo doesn't fit into a "rebuild". Our best-case scenario is that we'll be a contender again in 2018 built around a top 5 superstar (Andrew Wiggins) ... by then Rondo would be 33 years old on past his prime. Far more likely that we will not be a contender again until the 2020s...