They will not do all that no need , also can you imagine how a half full park will feel, it will be dead, no energy not a great experience at all. Yes lines will be shorter but the Disney excitement comes form the crowds to large degree.
Sooner than later we will realize the virus isn’t as contagious or as bad as was originally thought. Don’t get me wrong it is horrible and super deadly to people with high risk factors etc. however it does not warrant all of these changes to the park experience. There will be a few, more hand cleaning stations and maybe masks inthe queues , buses for a while but nothing much more