Depends on the purpose of the trade and the return, doesn't it? DD will return nothing. Eller might return something, maybe. I could imagine trade scenarios where moving Eller and keeping DD made sense. It isn't about them head to head by any stretch.
I think it's adequate in isolation. And for his paycheque this year and next. But he's jumping to $4.25M and $4.75M in Years 3 and 4 of his new deal, and I think that is indicative of the team projecting his impact to increase. They see potential, and we also see potential, because those 30 points are not usually distributed evenly over a season, he does seem to be a very inconsistent player, and not just in terms of production either. I think that kind of inconsistency really raises the ire of some hockey observers. When you see him string together a few games where he's controlling the play and cycling and chipping in points, it gets your hopes up. And it makes the next string of games where he's invisible and uninvolved more disappointing by contrast.
Anyway, I like Eller in general, but I have mostly lost any hope that he'll ever be better than he is now. What he is now is fine. But if a team came along who still wanted to bank on his upside after seeing one his strings of more impactful games, I could see trading him, for the right return.
It just seems like whoever is in the 3rd line centre role, be it Eller or someone else, is doomed to fail. Like I said, his production is right around what you expect from a 3rd line centre. If you want more, you need to give him the opportunity for him to do so, like PP time, ozone starts and better linemates.
However, it seems like those opportunities are with held from him on the basis of his "inconsistent production" or him "not proving he deserves it". But the problem I have with this is that when he does prove he deserves it like his point run in late november and december, or like his recent POs, or the 2012-2013 season, he doesn't get it anyway. In a sense, Eller is damned if he does, damned if he doesn't, and it's starting to appear like Eller knows this given his comments about his PP use.
Hell, look in the POs, Eller was the best point getter and couldn't get more offensive opportunities.
As for moving him, we'd just need to replace him with someone else, who will probably also put up around 30 points in that role, and then we will all be disappointed at that player for not having a greater impact, at which point we'll say, I don't mind moving him for a better piece.
The way I see it, Eller is filling his role as 3rd line C more than adequately. There are other top 6 players that aren't. I don't see the need to move the player that is filling his role, while keeping those that aren't.