No monthly fee.
When you think about how awesome this game is with its wide ranging features and incredible 'persistent' world, do you think ArenaNet is capable of handling its own game without a monthly fee? I cannot picture how they can do something like this on a grand scale, with such a popular game, and keep the lights on at their office.
I'm in love with what I'm reading, and hearing, but I fear what might happen if the severs end up lagging or having to be reduced in number. If the technical aspects of it all cannot be managed on their budget.
So the question is, will they do it, can Anet pull this off?
I'd be heart broken if such great ideas were tarnished by choosing the wrong financial model for the game.