Too many people missing the point. Universal will never rival Disney head to head. As pointed out the logistics don't even make it an argument reasonable people would ever subscribe to. But Universal can be a force unto itself.
Potter showed just how successful innovation can make them, within their niche and they forced Disney to ante up.Disney didn't want to add on. If Universal shuttered up tomorrow I guarantee we'd never see Avatar or anything else creatively interesting from Disney.
So the salient point, which Disney fans always seem to ignore, is that a successful and innovative Universal is good for all theme park goers. Without them, at this point, Disney would return to shopping center development and meet and greet additions.
Lastly, I was just pondering how great Disney might look today had Comcast succeeded in their Disney takeover and we'd avoided the Iger years altogether. Just wondering on this.