I'm not sure I agree about your timeline. Mid-April would be early, as it's already late-March. The virus is just starting to hit in some places. With a two-week incubation period and very limited tests, there is so much more virus out there than we know about. People are still walking around like it's nothing, spreading it. And that's especially true in less populated areas where people feel safe. The more populated areas where it's hitting are still seeing a doubling of cases every few days. I don't think there are any areas of the US that have hit their peak and are starting to dwindle. I read an article that NYC might be "slowing down" a bit, but that means new cases doubling every 4 days instead of every 2 days, which is still scary exponential growth.
I hope Disney won't be opening before Memorial Day. And I say this as someone with a trip booked for mid-May with amazing FP, ADRs, great hotel rates, perfectly timed flights, etc. If Disney opens too soon, people will flock to it (because as we've seen, people suck at voluntary social distancing), and we'll see a new wave of infections, that will spread out to other places as people go back to their communities. The best way to combat COVID19 is to stay home. Too many people are not taking this seriously, and are looking to get back to "normal" ASAP, which is a terrible way to look at it. Better to stay closed a little too long than open a little too soon.