Re: The Avengers (2011) = the end of the X-men?
I think that's debatable, but you may have a point. That said, X-Men 3 should have easily broken $300 million. Its opening weekend numbers are evidence of that, but it failed to meet audience expectations. After 2003, and even now, I think the X-Men franchise has been in a place in which the next installment can break $300 million, and I think Wolverine may do it (as long as it's not a let down).