All business are not shut down, many people working from home , essential stores, factories are open now, even with stay at home. So the economy is still 'running' even though is is a fraction of what it is normally. This will increase even more so once the peak has passed in an area, non essentials opening etc. Disney is way ahead of the small business owner you mentioned, they know what the are up against and have much more powerful tools and assets to handle it. The small business are going to take a big hit. Especially ones running on thin margins which is a significant amount. Orlando will take a big hit more than most of the country due to the tourist industry is primary.
It is not an all or nothing sledgehammer approach, it will be target surgical approach to bring things back online. As others have stated and it is a bummer for us the parks will literally be the last to come back, but they will.