There is absolutely no way that Steve Nash is an upgrade over Rajon Rondo. The notion is crazy to me.
We want to take a team whose biggest flaw is age and lack of athleticism and make them older and slower? This puts us in title contention?
As far as it being a move for the future, as BBallTim said in another thread, you are basically trading Rondo for Gortat. No thanks.
It's a win-now trade. The idea isn't that Nash is better than Rondo. Rather, that this team's biggest weakness is the center position, and the difference between Nash and Rondo isn't so great that upgrading from JO to Gortat would not make an enormous difference.
Based on some of your other posts, I have a really hard time believing that you think replacing Rondo and JO with Nash and Gortat would make us a contender. If that were the case, you'd think the Phoenix Suns are currently a contender.
Honestly, it just sounds like an idea to clear Rondo out and start rebuilding with Marcin Gortat.
While I'm not certain that replacing Rondo and JO with Nash and Gortat would make the Celtics a contender, I do think it would make them a much more complete and balanced team, and thus a lot better.
I don't know how or why you're jumping to the conclusion that I'd have to think the Suns are contenders . . . there's obviously an enormous difference, even now, between Jared Dudley, Grant Hill, and Channing Frye compared to the Big 3.