[quote=@Gareth]
This is insightful and pretty indepth conversation on the topic.  I'm gunna just put in my 50 cents in a simpler fashion.  

Would it be viable for every player to be a GM in every story on this site at The Same Time Through The Whole Story?  In my opinion no because it's too confusing about who's deciding where the next destination is at a given post and because it would take too much collaboration of people rapid posting back and forth to get a single post out.  People's timezones compounds the problem.  

Now I think your idea can be tweaked and could work in a story within the site.  There was a roleplay I was a part of a long time ago.  Where one gm would have control through one story arc and it sort of passed to the next player for the next story arc.  Now that's for a single story if you and the other players want to do that.  

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Well I probably didn't explain it too well, but ideally all the plotting of where to go and what to do would be hashed out before the RP even starts, hence my point on making an outline or deciding on a beginning, middle, and ending at the very least so that you have goalposts to work towards. As opposed to just writing whatever comes to mind in the moment or within one character's arc that hopefully connects with the main plot being woven by a GM. But I can see how the posting format might be problematic in that regard even with all the planning. And, additionally, how much effort that is to put in before the roleplay even begins, which given this is a hobby would require finding people with the same levels of competence, reliability, and motivation as you like Quartz mentioned.

And I recall a few roleplays like that, where each player controls a particular arc within the overarching narrative. Can't say I joined many, as I'm fairly certain a lot were set in DC or Marvel and neither of those series I'm really interested in, but that could definitely work.