Yes, corruption exists everywhere to varying degrees, but the level seems to be higher in Quebec. Why? Because (squirrel!) the political system is distracted from public service and towards nationalist issues.
Will the system be cleansed or at least taken down a few notches? Maybe, but I doubt it. The folks in power in Quebec have been there a long time, so they are quite implicated. Same for the folks running Montreal. Especially since the last policy statements from the opposition parties have been about language and not corruption.