This is eerily similar to the Subban situation and I believe it's going to play out the same way.
2012/2015: Subban/Galchenyuk's ELC ends. Player asks for X dollars and Y term. Bergevin beats the player down to a 2 year bridge deal below market value, and publicly berates the player ("Subban has to play the right way"/"Galchenyuk may never play centre")
2013/2016: One year into the bridge deal, both players have career years, Subban wins Norris/Galchenyuk scores 30 goals.
2014/2017: In the second year of the bridge deal, both players again produce, Subban gets a Norris nom/Galchenyuk is as high as Top 5 in scoring before his injury. Then the following summer, Bergevin and Subban go to war again, Bergevin finally only caving when the owner steps in. You can be damn sure that this would happen again this summer with Galchenyuk, but I don't think it's going to get that far. He's not the bonafide star (yet anyways) that Subban is, and it's abundantly clear when I watch the games that Therrien doesn't like the player, much like Subban. On top of all of that, throw in the historic collapse of last year, this year's mini collapse, the pressure to win now in the wake of the Subban trade, and yeah....I smell that something is up here.
And for the record, Bergevin's worst move wasn't a trade, it was how he handled the Subban situation in 2012, again in 2014, and again in 2016.