The longer the shutdown lasts, the more and more businesses will drop out of the market, both small and medium. Once the credit lines dry up it'll be extremely difficult to restart business once this is over with. Perhaps we can have a month or so being shutdown, but even that is a long time. In a perfect world, we could just test everyone and know who had it, has it, or doesn't have it, and base re-opening decisions on that data.
I'm looking at this from my point of view. Many lawyers do traffic law. For some it's part of their business, for some it's all of their business. There is literally no traffic in Belgium now though. Which means no accidents, no fines, no court cases. If this lasts 3-4 months, you can bet many firms are going to feel this and will have to cut people.
And then there's the fact that more and more people will say they can always work from home. Which again means less traffic, but not just for a few months, but indefinitely.
This is just one little aspect in one area, but I'm sure there are many similar changes in other areas.