Yes, but what are you going to do with that D prospect this year...who sits, or do you go psycho and move Hronek also , knowing that he's definitely not going to be back next year. You get a young top forward as well as a top young d man.
None of the above I want to see done, but you are correct, they will need D next year.
Middleton is key to next year if you trade him you better get a D-man back for next year. As far as trading him l wouldn't. I would move hronek before Middleton.