The control panels developers can put them out of business fast once they develop their own full featured installers. There would be virtually no need for addons like Fantastico and Installatron then.
Well right, but I meant the setup itself rather than who puts it out - whether its bundled with cPanel or not. I suspect cPanel will do it sooner or later, but I think it's a ways down the road. They don't seem to concerned with this particular aspect and it will increase on overhead in terms of having them update so often. I think that's why we haven't seen a quicker rush to make this a feature versus and addon.