This raises some interesting points. Are there ways to set up a world so that the players can impact and change it without GM intervention? I think that's the core thing we need -- to know that our stories are canon and exist in the interconnected world, and can change the broader story.
Then there is the babysitting. There will always be issues between and with certain players. Somebody has to deal with that stuff. Arguably it could be made a little easier by putting the tools to control what they have to see in the hands of the player. There seems like lots of momentum in that direction, in fact.
If you can put a game in place that the players can guide and change without a GM and empower them to deal with their own conflicts somehow, then you'd eliminate a lot of staff work right there.