Their motivation is profit, as we all know. I don't really care what Disney's motivation is, I care about what kind of experience I have when I pay to go. If they do what they say they're going to do, guest experience will be better, plain and simple.
We saw what happened when Galaxy's Edge opened in Anaheim and no one showed up. More and more people have gone to Disneyland or WDW, found it to be overly crowded, and are less likely to return.
I don't know what the casual fan knows about things like annual passes and how they have changed crowd patterns, but they do know that it's not worth $100+ to be packed like sardines in a theme park. A lot of people are less interested to pay big bucks to be crowded into what has become a cheap hangout for locals.
If Disney can manage crowds, and provide a good experience for all guests, they'll encourage tourists to come and can still use passes and other discounts to fill in the gaps. It can be a win-win for all involved.
Disney loves the AP demographic with good reason, but if they serve that group at the expense of tourists, they'll lose customers, and Disney parks cannot survive on discount loving locals alone.