I just find this whole discussion quite amazing sometimes. Rondo came into the league as a peculiarly talented late bloomer. Season after season he's made his game larger and better. Yes, there have been ups and down, and not every aspect of his game has been on an unbroken upwards trend line, but the overall trend is not only clear, but dramatic. This is a kid who was in mvp consideration for a good chunk of last season. That's quite a leap for someone who looked like he might not have a place in the league his first season. Yes, last season ended badly, but we all know how disrupted things were, and why. So why don't we stop looking this gift horse in the mouth, huh? We are lucky to have such a talented guy to build the future of our team around. Of course there's no guarantee that Rondo will rocket into the future as the superstar some of us think he can be, and maybe he'll even fall on his face, but I don't remember many sure things other than Lebron, and even Lebron can be said to have fallen on his face in some ways. No player is perfect and no brilliant future is ever guaranteed. But, based on what we have seen so far, we have a heckuva hopeful start with Rondo.
P.C., I'm going to be honest, and please understand I mean no offense, but I hardly ever do more than glance at your posts because you never break them up into smaller paragraphs. a tiny wall of text is not fun to read through, especially when i do enough of that for school.

There are big players, small players, fast players, slow players, good shooters, bad shooters, and more than half of them averaged less than 15 points a game. I don't think it's more rare for point guards like Rondo to have long careers than point guards like Nash.
long careers? perhaps that's true. but long careers where they play at an all-star level past their late 20's / early 30's? the list of players is likely much smaller there, and the list of such point guards who played at a high level past their late 20's who weren't out and out superstars to begin with seems to me to be even smaller.
If we are working on the assumption that Rondo has finished developing as a player, you may be right. That just seems to be an absurd assumption.
I'm not sure how absurd it really is. I think it is not unreasonable to think that Rondo might significantly improve his outside shooting as he ages, though I doubt he'll ever be able to create his own shot from outside or anything. Certainly other weak shooters like Jason Kidd have been able to do that in their later years. We might expect Rondo to reign in his game and reduce his turnovers, or improve his discipline as a man defender instead of ranging around gambling for so many steals.
I think it's unreasonable to think that after 5-6 years in the league he's going to really take his game as a whole to an entirely different level. Almost all players, especially guards, and especially players who have received as much playing time in their first few seasons as Rondo has, have pretty much become who they are going to be as players by their mid 20's.
That's why I think that what you see is what you get with Rondo, for the most part, other than the kind of basic improvements you see as most well disciplined, hard working players age. There's certainly nothing wrong with that; Rondo is a very good player. But expecting him to blossom into a MVP-caliber superstar in the next couple of years is pretty silly, in my opinion.