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I might be a bit slow on the uptake but I've just been told about 'Cloud-based gaming'.
Basically the game is run as if it were in your browser, using a video stream or something, so much older and lower spech hardware can run games online (because your processor isn't doing anything more than streaming HD video).
I assumed it would only be for Bejewled 2 etc. but having visited Gaikai (website offering cloud based gaming recently purchased by Sony) and seen the catalogue of games they have demos for (including Tera!! -- Which I played on my macbook air and the fans didn't even go above rest) could we see this as a future, not just for Guild Wars 2, but all MMOs?
ANet have said they want the game to run on the lowest spech computers possible, so this seems like the ideal solution!
What do you all think?
EDIT: Other websites also offering cloud based games exist, just mentioned Gaikai because it had a Tera demo