Also I'd be surprised if they opened up the parks just for resort guests. It is massively expensive to open/run the parks and they pretty much count on them being pretty full most of the time to make it worth it.
It would not be responsible for them to open up to everyone until the infrastructure is mostly back to normal in the surrounding communities (of course there will be lingering issues to be addressed for a while) and provide temptation for people, there is a lot of flooding and emergency crews are tied up and need people to stay out of both their and harm's way while they are dealing with the immediate issues. Right now they are asking people to stay off the roads, first responders are overwhelmed and don't need people getting in more trouble because they are trying to get to Disney right now. I think Disney will remain closed as long as County officials are requesting people shelter in place and stay off the roads.