Your absolutely right, the MCU film people were saying this was going to destroy last year was Age of Ultron. Since that goal is laughable at this point people are holding on to the #1 comic book movie of the year thing, which puts it in direct competition with the only other comic book movie released so far this year Deadpool. Once Civil War is released if it passes this in numbers then they will hold on to it making a billion, if it does, in order to say it's not a disappointment even though it clearly fell below expectations.