Galchenyuk is certainly a tradeable asset. I can see them trading him for a less productive player offensively who is better away from the puck. Such a trade would not improve our team, however, because it would strengthen us in one area (defensive play from C) while weakening us in another (offence), while continuing to leave us in a position where we're lamentably short of talent at C.
Equally likely is a trade that brings back a comparably productive C who is defensively superior, but a lot older (and more expensive). MB might well do this, since he is already 'all in' for winning the Cup within about a three year window, given Weber's age. And given that this year's team is probably a long-shot to win, he may be starting to get desperate.
The only trade we *should* be making would be of the first variety - for a defensively superior C with less offensive upside - that ALSO included a top-4 puck-moving defenceman. Such a trade would be a long shot for sure, but perhaps not impossible.
Given that MB's only blockbuster trade so far was a dumb-ass move that shortened our Cup window without improving the team overall, I'm not optimistic. But then again, maybe he is due for a home run,