I have no data beyond my own use (BBC shortcuts are handy, too) and the fact that Blanko went out of his way to keep them working during the theme redesign. Combined with the fact that they don't (to my knowledge) clash with any browser functionality, there is no case for removing them.
EDIT: We were also just asked for more shortcuts. Reducing them in response would strike me as counter-intuitive. If anything, I'd suggest rethinking Thork's suggestion in principle, just ignoring the specific suggested shortcuts and designing them in a way that's unlikely to clash with other functionality.