I think you're right, but I don't think 'colonization' ever really stopped in Ontario - it just moved elsewhere. While Quebec was incentivized to develop its regions, there were more valuable places for Ontario capital to flow to, such as Alberta.
The difference between the two is language really and the urge to develop Quebec as a sovereign country, that drive has never been there for Ontario because Ontario is Canada, at least in the eyes of Ontarians. You don't see people in Ontario proud of being Ontarian as you do in Quebec, the Maritimes, Alberta, etc, instead they're proud of being Canadian.