Krustyland were added to the game too early.
Krustyland got extremely criticized for the way too long loading time to the point where the developers ended up abandon Krustyland completely.
The long loading time were mostly a result of the slow devices and internet connections people had back then.
After I have switch to a iPad Pro and a fiber connection I can load Krustryland in 3 seconds so the loading time isn't really a problem anymore.
So Krustyland's biggest problem is quit simple that is was added to the game before people had devices and internet connection fast enough to load Krustyland before they fall a sleep.
Today Krustyland's problem is the lack of contents.
You have to be very creative to make use of more then 1/3 of the land available where.
EA could relatively easy fix this problem by simple let us move event buildings and decorations to Krustyland.
I my option most event decorations and buildings really fits better into a theme park then a city anyway.
This would also be a help for all of those players that had hit the 8K building/decoration limit on main Springfield.
So letting us move more to Krustyland is big win-win for everybody!
I think the main reason why we can't move more event item to Krustyland is quite simple because those event items were added to the game after the developers had abandoned Krustyland doe to the extreme criticism they got for the Krustyland loading time.
In other words we have a saturation where problem 1 lead to problem 2 and now that problem 1 is gone we are stuck with problem 2.
The fact that Krustyland has been mentioned in the last few events makes me hope that EA is working on a big update for Krustyland. But I have no idea about if or when that will happen