Would you still play the game and not bot? Would you bot? Or would you quit the game in disgust? I'll admit that if Jagex changed the rules I might consider it, but more than likely I'd probably just quit all together. Not only do I feel there's no point in playing a game you don't actually play, but I couldn't see the point in playing a game in which you would almost assuredly be competing against a bot. As it is, it seems that most people bot because they can get away with it. If botting were legal, I'd expect the vast majority of Runescape players to bot themselves.