The argument that orders will drop off from $40k-50k a day to...

The argument that orders will drop off from $40k-50k a day to near nothing post Corona, while plausible, makes a fundamentally bad assumption.
it assumes that this is the theoretical peak of the order volumes. there is as much chance that this volume will continue to climb to new levels before settling back to the $40-50k a day range.
Without analysing the actual market size & demand for this product/type of product, people are just making up whatever they need to, to justify their position.

There is also the chance that the last 7 weeks were a fluke, & may never be repeated in the history of the universe, time will tell.

As for now they have a solid base to build on, solid demand for a good product & revenue to continue to grow this. As for long term demand, these major scares tend to change behaviours and lead to creating a more regular demand for these types of preventatives.