Universal has capacity issues, especially when it's busy. Bottom line, their overall park capacity isn't much more than it was when they had half the attendance they now have. WDW has the same issue. It's not really conducive to customer satisfaction if they shut attractions down for negative effects that are worrisome, but not crucial. In a perfect world, both WDW and Universal would have been more pro active with their maintenance, but unfortunately both park systems have been short sighted, probably due to not wanting to spend the necessary money towards 'full' refurbishment, and wanting to impress investors and top executives with glowing quarterly reports.