Mask policy is not going to keep WDW closed until the fall.
As I've said a bunch of times, Disney is not going to keep losing $20-30 million per day for some indefinite period of time. Universal won't stay closed. Neither will SeaWorld. Neither will the state of Florida or the city of Orlando, as they need tourism to start back up just to be able to survive economically. With DS now phasing opening on 5/20, it suggests to me WDW will be open at some point in June, whether its a "soft" opening or a phased-in opening of some sort, or a full-blown opening. People need to be coming to the realization that WDW will be reopening. Soon.
The bottom line is people are simply going to have to decide for themselves whether to come or not once the policies are put in place, whatever those policies end up being. I think the one thing Disney is torn on right now regarding the masks for guests in the US is that they know it will affect their bottom line negatively....it will be a deal breaker for many folks. It just will. And from a CM standpoint...imagine being a CM and having your job be on a daily basis to walk around and tell people ON VACATION to put their masks on if they are made mandatory. Yeesh. Not only that, but from swimming to eating to many attractions, wearing masks are simply not possible. You can't compare people wearing masks in Asia - where they are more commonplace in daily life - to wearing masks in this country. One of the biggest reasons WDW sent that survey out about what people will accept and not accept is so they can figure out how FEW restrictions they can have while still maintaining the balance between health and people having a good time on their vacation, all the while being able to take in a good amount of revenue. They're finding out what the true deal-breakers are for people. I believe masks will be one of the more polarizing answers, and the biggest deal-breakers amongst many people, especially families with young kids.
One thing they may try is having masks mandatory for theatre-style attractions where you may be sitting close to someone. Masks may be required for Disney transport. Some retailers may require masks to visit shops at DS. Masks will almost certainly be mandatory for employees. But I still find it next to impossible to make it mandatory for guests to wear masks in the parks.