I don't think many people outside of Habs fans know of him......at least not yet anyways
So he probably wouldn't fetch much in a trade.
Anyways he is having a great year and going to play in the Memorial Cup, see what happens with his play and take it from there. Habs aren't going to move him now and if they do it would be for a late pick which wouldn't be very smart
Yes he has been playing great this season and looks like he could be a steal of a fifth round pick.
The most that he would return in terms of a roster player would be a very depth forward or defenceman. No need as White and Nokolainen (when he returns from injury) will be of equivalent skill set. No need for a defenceman as Kaberle and Weber are healthy scratches. Then you could always call up a Dumont or Leblanc or St. Denis or Tinordi or Beaulieu as depth if need so.
That only leaves his value as picking up a draft pick for him;
-No way any team gives up a first for him
-Unless a team absolutely loves him they will give up a second. That is highly unlikely because they could just draft a D with their second rounder
-A team may give up on a third. Even with that i would rather take the player that is good looking prospect rather than 'upgrading' to a third and potentially drafting a player who will never be as goo as Dietz.
With all that being said I think that Dietz is a good prospect with a potential future in front of him. I would only trade him if he went in a package deal to upgrade the team.
Let him go to Hamilton next year and develop. Eventually their will/may be a log jam of NHL playable D men in a few years with these players;