Look, even if they were to open tomorrow, no one is forcing anyone to go. The only thing that would make me disappointed is people who would choose to go knowing the risk and then complaining/blaming Disney if they contract the virus. It would be a PR nightmare for Disney even with the best guidelines, if there was direct correlation between the parks and a surge of COVID-19, which is why they have not reopened any of the U.S. parks yet.
My thing is and has always been: I need to be able to test (and confirm) I have antibodies before rejoining society in general.
Before you feel your magical place is ruined just keep in mind some things the first being the parks do not have a opening date as of this writing.
Next, WDW has a large challenge to face. I personally wear a mask whenever I go out. I go out grocery shopping and sometimes to pick up food. I am not wearing it all day as I am home most of the day. I believe it is the responsible thing to do at this time. I am hoping for significant improvements in COVID-19 prevention and treatment because I can tell you now with a vacation booked in November, I am not wearing a mask for my 12-15 hour days at WDW. I would rather cancel my vacation because for me, that would be a dealbreaker. I believe right now people should wear masks.
Like I said WDW has a large challenge ahead. If masks for guests were mandatory, I'm sure there's people who will not want to wear a mask for 12 hours in Florida heat like me. So people like us don't go, that's a safe and responsible thing, don't participate. But then there's people who feel like me and won't want to wear a mask but will go on their trip. Disney has to now deal with that conflict. OK, you wear masks. You wanna go in the pool and several people wanna take it off for that. OK, well if you're going to expose/be exposed for 3 hours at the pool then why not 8 hours at the park? So OK you go to the park with your masks. Your kids take off a mask, another kid takes off their mask you yell they put it back on. Their cranky and hungry and thirsty so you pull the mask down they eat their food in the ziploc bags, they drink their juice box, all uncovered. You'll have people like me who have been exposed to the virus and doesn't care. You'll have cautious people. You'll have angry people there with their elderly parent and now they berate you for giving your kid a juice box in the middle of the park. You have so many variables and so many fears. It's why I actually don't think WDW Parks will open with masks, at least not for long.
You have to appreciate the fact they have to think about these things. It's easy to put a bullet point on a website and say if you're coming here you're wearing a mask. It becomes a novel policy once the masks continually go on and off. You're told by a CM to put your mask back on, well now Disney isn't this magical place "they're mean to me". So these are the issues with just one policy they have to think about before reopening. Now imagine all the others. How do they know how effective they will be?
They're going to a phased reopening of Disney Springs and that will help them see what people will do in a setting that requires no admission fee. This is a chance for them to hope to get answers to policy issues they are considering. Maybe my theories above aren't as bad and they see people can stay at Disney Springs for 6 hours and never remove a mask except to eat in an indoor socially distanced setting. Maybe they'll find flaws in the socially distanced dining areas and learn from them.
So how soon is too soon? Unfortunately it's a learn as you go situation. I think they need to learn and Disney Springs is a good way to do that. Maybe they do open too soon and all their policies go out the window because people will do whatever they want like we all usually do and it was a mistake. Do I blame them? No, because it's a choice. I think if you have a June 5th reservation and now there's policies announced last minute that will make your vacation miserable so you cancel and they try to ding you for that, then sure I blame Disney for that because now you're coerced into going. Otherwise, it's a personal decision but if people are going to go and think it's going to be a super sanitized place with everyone wearing masks, I hope they have the Genie to make that wish come true. It's going to be sloppy. You going to order a coke and hotdog go where to drink it? You'll have to take off the mask and eat. So you try to social distance and someone's kids scurries by you and now you're the monster exposing their kids to potential coronavirus. Is it your fault? No of course not. If WDW opens in my opinion the only one to blame is whoever went and thought the consequences wouldn't apply to them.
That said, if you can go and you're either willing to accept the risk or you have antibodies are feeling confident you should enjoy it all if you can. I don't think you should let the attempt to gauge how people will adapt as a unmagical place now. You shouldn't let anything take that away from you, it's a special place for you and it should be, even if it can't be right now.