It would be nice to see Plus-X back.
E6 as well.
Ironically, if they are able to re-establish a reasonably effective distribution chain, and have some success with it, it may prompt the (re)-development of some older, discontinued products.
Especially ones that don't require re-introduction of chemistry.
I wonder if we might see the return of Kodak instant materials!
I would certainly expect that improved distribution could prompt the re-introduction of certain sizes in sheet film, and maybe even sheets of colour paper.