OP here. Sure, you can redefine pixel, that's what was done. Why do you need this measure though? 1/96th is so close to points, you might as well just use points and now you're on a universal system.

Pixels use to mean something (a pixel). Now they're used as an absolute unit of measure so that websites (nearly all of them) based on this assumption don't break. Do we really need this unit? Isn't it confusing (1/96th does not a pixel make)? If we stop using it incorrectly maybe it could mean pixel again. Wouldn't that be neat?