I would absolutely not trade the rights to swap for Brooklyn's 2017 pick for Okafor.
He just hasn't looked anywhere near as good as he was hyped to be coming out of college. I was a huge fan of his, being a Duke fan, but have been rather unimpressed and disappointed with his development up to this point.
Whether or not such a deal was previously discussed or not carries no relevance. Even if Ainge was previously willing to make such a deal, I would wager there is no chance he would now.
But this isn't to say Philly shouldn't be asking a high price. Why trade Okafor now, if his value is at currently at its lowest? He still has two years remaining on his rookie deal, and I don't think his play is going to deteriorate.