Although I'm there for the open world, I don't have a problem with a Main Quest. I would be perfectly happy to have the option of telling the game that my character is not cut out for a Main Quest and allowing the game to use an 'NPC' to complete the quest so that it happens around her - but still happens. I think that would be a cool option for future games - you could do the MQ, ignore the MQ, or decide to let the game have the MQ happen around you. I long ago outgrew playing th only 'Chosen' prophetic slob who could save the world.

In fact, having heroes complete the MQ while my character's role is somewhere between sidekick and observer is exactly how we handle the Oblivion Crisis in Buffy's fanfic.