Sellers sell where buyers go. Unfortunately, Amazon today represents a very-very large portion of online sales. And if you don't sell there, you lose. And convenience (I think? I don't think it is a place to find a best price anymore) looks like it takes over concerns over small business.
You can bet sellers will move where customers go. Unfortunately, that is not happening, and if anything, during that virus time, Amazon appears to increase its positions (another interesting topic to discuss, btw).