If any developer who has worked on these homebrew "floppy disk emulators" is interested in working together to bring one of these to the market I feel they could be made commercially viable.
Especially if it targetted towards multiple platforms (Amiga, AtariST, Spectrum, C64, CPC, BBC etc.) and includes support for protected disk formats.
I would certainly be interested in offering technical and hardware assistance, together with commercial expertise and manufacturing contacts on how to turn this into a real, saleable product.
I have many ideas in this area which could reduce the BOM considerably and improve usability.