World shaking events are boring as ****. Especially when you try to
start a new era in an intellectual property with one.
I don't care at all about your stupid world yet, guys. I don't care that you're blowing it up, or bringing gods back, or using the most cliched 'Extreme Fantasy Doom' word of them all: sunder.
(Well I kind of care that you're using that word, because it sounds ridiculous, to the point that it was parodied by Penny Arcade with their fake fantasy setting's
timeline, which had The Great Breakening, The Sundering, The Unsundering, and then The Resundering.)
Just start a new story, don't make it about world-shaking events, and let me grow attached to characters and locations. All you need to do is obliquely reference, "Oh yeah, some real crazy s*** went down a decade ago," and let that be that . . . for a few books. Then eventually, once we care about these characters, weave that backstory in so that it matters to what's happening now.
To me, starting with a multi-author interconnected world-spanning plot line is just getting ahead of yourself. Prove to me that you know what you're doing with one amazing story -- basically, get people talking about Robert Downey, Jr. as Iron Man -- and then see if you can build enough trust to create The Avengers.