What if Marvel & DC merged?
Caught an article about Marvel's history; seems they tried to buy DC Comics in the late 1970's, before they were ultimately sold to Warner Communications, where they still are.
We could speculate as to what comics would look like now if it happened then; but what if it happened now? How would you like to see all these characters come together? One earth, or two? If two, closely linked or not? Great companies have been merging since the 1980's, so it's not inconceviable this might happen one day.