[refurb]

For lack of economic need.

Exactly, and because of lack of economic need our experience with creating vaccines against coronaviruses is pretty minimal.

And yes, I agree that we'll get something, but people should be prepared for a few of the vaccines to fail, a few to be pretty mediocre (are they worth even getting) and a few that actually have some utility. The challenge is the ones in development are strung out along a pretty long timeline, so if we're lucky, one of the earliest ones works and we don't have to wait until late 2021 for something worthwhile.

And not only that, but people should expect something promising to be approved and then likely pulled off the market 6-9 months post-approval. It's just the nature of trying to accelerate a vaccine and then once approved, dosing tens of millions of people with it.