My goodness you are hilarious. Smart and a Brooklyn pick to start? For Noel? Noel may well be a defensive force, but he is no game changer. I don't see him dragging Philly's defensive rating to a respectable level, something you expect from a TRUE defensive game changer like Howard, KG or Davis. Smart on the other hand has shown that capability..
Noel had that Philly team in the top 10 in defensive efficiency last year. He's been moved to power forward this year and has had to try and cover up Okafor's mistakes, which are many.
You can bet that Philly will expect a return on Noel commensurate with what he's done at his best, not how he's played this year. They have no reason to rush to trade him if the market for him is depressed by their current situation.
They will look at Noel as one of their building block pieces, a guy they got with a top 10 pick and who has shown the talent to be one of the best young defensive bigs in the league. If they don't get a really tantalizing offer for him, they'll keep him.