For the sake of argument, let's assume this abortion of an idea is actually a real rumor...
Ahem.
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1) Doesn't Staal have a NMC? If so, would he waive it for Montreal?
2) Can the Habs fit Staal under the cap without very significant retention?
3) I don't care if the pick is the Rangers' 1st and they retain 50% on Staal, there is no universe where moving Galchenyuk for Staal + a pick makes sense for Montreal in any way. It would be "break the internet" bad. Not only does it remove Montreal's main (and only, since other valuable pieces aren't being moved) trade chip for a desperately needed center, it actually makes their current defense worse since Staal is absolutely freaking horrible.
Since I'm a Toronto fan, I would give almost anything for Montreal to move Galchenyuk for Marc Staal + a pick because that would all but guarantee no Stanley Cup for the foreseeable future. I see no way that happens though.