Isn’t it inevitable that Marvel Island will go away at some point? My understanding is that Universal can only do so much to “upgrade” the area.
The same can be said for any area. As far as I can figure, the only thing that's off limits is using the MCU and even then, I think a deal is there to be made if they wanted to but it would cost a fortune.
I think they have the ability to do whatever they want and Disney aside, the people who have been at Marvel since the 90s absolutely adore Universal for taking the risk of putting Marvel in IOA and having Spider-Man being associated with one of the all time greatest rides must put a smile on their face.