Originally, the generics (which had plain black and white packages) had their own dedicated isles. Now the generics are put on the shelves next to the originals and all those "generic only" shelves got filled with regular products.

I've still never seen a brand new product show up in the store and become popular only to be pulled off the selves and replaced with only a generic version of that product. When I see examples of that happening, I'll accept that grocery stores are guilty of doing what amazon does.