whalan84: The motion sickness is more than just lag because of an old computer.
Certain FPS with "head bobbing" will make you nauseous right away. Some others won't.
I used to be able to play old FPS like Wolfenstein3D, Doom, Quake and so on for hours when I was younger I'd feel nauseous but it would take hours before it would declare itself and be really noticeable.
As I grew older, playing those same games on far more powerful computers I lost the stamina to do so and felt the nausea coming far sooner (a matter of minutes instead of hours).
It's more a physical human issue than really a computer hardware problem I believe.
As for the support, well as I said, if browser vendors do ever support OR and interface it with HTML5, it could be possible.
But I'm not sure that's a priority for them, especially since apparently at the moment, 2D fonts are still a bit blurry within the OR and so long reading sessions are not the most fun activity to do on OR, whereas on browser it is still OK.