This is just my open post to the big three owners of Marvel Character properties in the film industry. Even more targeted than that, I would address the powers that be at those studios.
Dear Mrs., Ms., or Mr. executive,
Do you like to make obscene amounts of money? More money than you could possibly imagine? If the answer is yes, and I know that it is… then join forces and make epic cross-over films. The Avengers, Fantastic Four, Spiderman and the X-Men are huge properties by themselves but mix them together and you will have a potent recipe for making the kind of box office returns that you could only dream about. Who cares about top billing or which company takes lead on the project… ego and business should never mix. Even Hugh Jackman would love to have a cross-over film. Allow Marvel to take the reigns and the rest of you can sit back and reap the profit.
Don’t get me started on even larger cross-overs with Warner Bros. A JLA vs. Avengers film would just be too mind blowing, if done correctly.