Disney had one major chance to stall Universal and prevent them from ever making a big surge... that was if they had locked up Harry Potter a decade ago and prevented that from ever going to Universal.It's not.
I'm not saying it's going to ruin Universal! All I'm saying is that another park costs a ton of money. If 2 open around the same time, and one is significantly better than the other, well one is going to probably have a harder time breaking even, which could stall future development. That's all.
Now that Universal has Harry Potter and brought in Nintendo as well as seen its animation division take off with Illumination and a buyout of DreamWorks; Universal is pretty secure. They have more than enough IP to justify a 3rd park and the attendance rates justify it as well.
This is not the same theme park operator it was pre-2009 when it was underfunded and starved by a series of problematic corporate parents...