When audiences simply failed to warm up to the now-clean Robert Downey Jr in the role of Tony Stark it was only a matter of time before Marvel decided to pull the plug on it's studio venture and do whatever it could to protect it's core business. While it continued to enjoy a small-scale success with it's comic book and animated TV series productions the company was clearly done with the live-action movie sector and never looked back after the rights to it's most popular characters were divvied up and sold to the highest bidder. And while it has resulted in a number of successful standalone productions from other studios using the characters over the past decade - with a few crossover exceptions we have never gotten to enjoy a true, large scale unified Marvel universe on the big screen like we have enjoyed for years in the comic books from which they were born.

So my question is this: If 2008's Iron Man had ended up being a massive box-office success which led to further success with other characters and movies then what might the past 13 years have been like if we had seen them all brought together within a single common universe and how would that have been done? Or like many have said over the years is such a broad goal spanning multiple years, characters and movie productions simply "impossible to film"?