Majority can only be economic

All other "majorities" have nothing to do with Bitcoin. If most users (in this case represented by exchanges) stick to some other version of Bitcoin, hash rate will be instantly rendered null and void. Really, what's the purpose of all these peta and giga hashes per second if you are mining your variety of Bitcoin all alone? I'm curious if Jihan and his cronies are going to reset the difficulty (let's assume for a moment that they are really going to fork Bitcoin in the first place)