Personally, I liked how Drouin finished the year. I think he was a lot more engaged, produced a lot more consistently, and looked a lot more comfortable at center. If he can carry that over to next year, I won't be upset if he's still a center. If he is a center, however, I'd much rather he be a 2C and not a 1C. Like
@417 said earlier, if he's more sheltered, while still being a Top-6 player, then it may be beneficial.
I personally would rather have Galchenyuk in the middle than Drouin. But I don't lose sleep over Galchenyuk being a winger and Drouin a center. I recall when they were put on the same line, they looked great together. And I had also noticed that during their shifts together, Drouin would actually end up playing closer to the boards as a winger and Galchenyuk would end up in the middle of the ice. And whether one is labeled a center or winger, in the flow of the game, they'd naturally revert to those positions.
Either way, I want them both to be part of the Habs going forward as both ended the year on the right note. Should they be able to start the year like they finished it and keep it consistent all season long, whether one is center and the other winger won't matter much to me as I am of the opinion they can both be part of the solution going forward.