Based on 2015 numbers, Disneyland had over 18 million guests while Disney’s California Adventure only had about half as many.
The opening of the Guardians of the Galaxy: Mission – Breakout ride recently is the first step in an eventual Marvel Land at Disney’s California Adventure and it’s clear from the wait times that ride saw upon opening that there is certainly a demand for it.
So perhaps, Marvel is the solution to bring more bodies into that park.
Guests clearly have a preference as to where they’d like to go, but Disney would certainly love to see those numbers grow more even.