Campbell
Relaxed Intensity
I think this is fighting the tide, at least in games with an even quasi-traditional role for the GM in managing the game; he's always going to be the one who ends up holding that bag unless the group is abnormally good at managing it internally (and I use the term "abnormally" deliberately).
I tend to agree that too much authority is assumed to the GM, with the sometimes accompanying expectations, but this is an area where I don't seriously see much better options for most people that are going to actually work.
My personal opinion is that in any game with a dedicated GM role taking on that role also means taking on a leadership position. Not just authority, but also accountability and responsibility. The issues we run into are not generally about one party having too much authority, but about not being accountable to the other people at the table. Does that make any sense?