I've seen that Norton comment before and he comes off as taking the higher ground for sure. Now he and his agent may have been pushy or out right jerks in closed room meetings but in public on this matter Notron came off better. That piece says his Agent had harsher words, I wish they had recapped those, I don't feel like hunting for them. Friege came off as looking like the douche in this matter. I think it's why a large amount of fans are upset still.
As noted for visual continuity it would've been solid. I bet sold more TIH DVD's down the road even. Short sighted by somepeople somewhere I'm thinking. As a fan of TIH I still would love for some brief cameo by someone from TIH to bridge the film into Avengers also.