This was the closest I could think of, the broad expansion of the Marvel IP. It's losing some steam but that has been the biggest win. I am enough of a hater that I personally won't give him full credit as Marvel Studios was already working through their plan with Paramount and Universal at the time of purchase. I believe The Avengers was the first movie to be distributed by The Walt Disney Company? I think it's still a modest success without Disney but you can definitely credit Iger for pouring on the rocket fuel.Probably the MCU. Not every individual MCU film was a huge critical and financial success, but it's been a massive success overall.
The first two films of the sequel SW trilogy were very successful both critically and financially too, even though I wasn't a fan of any of three.