To develop an NBA ready center out of the college ranks, that can defend, protect the rim, rebound, score a bit, and be an overall positive factor, is about a 3- 4 year deal.
Seldom do you see a center, other than a Shaq type, a once in 10-15 year prodigy, take less than 3-4 years. So if you can't get a young decent center very shortly, trade Rondo, and Greene, and Bass. They will be at the end of they're careers when your college center is getting into his productive prime.
I have to ask this question, if you're DA and you want to keep Rondo soooo bad, then why did you draft Smart? Insurance? Marcus Smart will never be a high scoring, slick shooting 2 guard. He reminds me of Dennis Johnson. DJ could play the point or 2 guard, and be valuable at either, but mostly at the point, because he could really defend and was a totally unselfish player. Hopefully Smart will be the same type of player. A great guy to go to war with every night in my book, and in fact captain material.
The Celtics have to find out if Smart can be a solid NBA point guard. And pretty fast.