I am a fan of speed & skill, but wouldn't shed any tears for MJ getting packaged up. His skill level is average for top-6 and physically he's unimposing at best. He has straight line speed, but is neither a big Scud missile like Chimera, nor a shifty little dynamo like the Purretu's of this world. I think he has trouble using his speed to actually impact the game.
What exactly would the Caps miss if he's gone? Nothing, really. Except for improvement potential. It's still there, and maybe he has Zetterberg-light late-blooming potential, but at this point you can't count on that. If you have a chance to move a question mark like that to improve the team, you do it, IMO. Maybe he himself needs a change of scenery.
However, I'm certainly not advocating moving him for the hell of it. We need 2C (much) more than forward depth right now, but cheap depth is not bad to have, and he provides it.
On the other hand, Wilson does have at least three excellent abilities -- he's big, he hits, he fights. And he seems to have enough mobility to not be a liability on defense. Even he ends up not having NHL skill, it's good to have at least one guy like that in your bottom 6. I wouldn't package him up unless we're talking fillet mignon-quality 2C. Which ain't gonna happen. So he should stay. Actually, I'm not sure anybody here wants him gone, fwiw.