Well, I don't think it's a question of if he may or may not pan out. He's widely regarded as a top 4 D for sure, probably top pair. If we added him, we would be adding a need (top 4 LHD) and basically locking up our top defense pairs for, possibly, a decade without significantly hurting the future. A top four that looks like Trouba, Enstrom, Maata, and Bogosian is pretty damn hot. As has been said, Wheeler is easier (and don't misunderstand, I'm not saying he's EASY to find) to find on the free market than a top D.
And I don't think we'd take him straight up either, I assume that Chevy wouldn't make this trade straight up. Wheeler would require Maata and another prospect/pick. This would just be on the reasoning that we have all the leverage in this situation.
But I think it's a fantasy. I don't think it'll happen. Just talking about what ifs, at least from my perspective.