I think there's a few more that can get added to the list. But then I would be engaging in homerism. Sam Adams definitely had a huge impact in the Northeast brewing scene. I fucking hate Harpoon, the company and the beer. They ruined a whole bunch. Micro-InBev.
What drives me nuts is that Boston Lager became hard to find in restaurants. There would be Boston Lager advertising plastered everywhere but all they would have were the trendy flavored crap Sam Adams beers. I only like the Boston Lager.