Heather that's a good point about the Instax cameras. I've got a mini, which I find fun to use in a Holga sort of way: it's so limiting that it's challenging.
I doubt we're going to see more advanced Instax cameras from Fuji. Polaroid, in its heyday, had a big market: kids, amateurs, hobbyists, pro-sumers, and professionals. So they made cameras and film for all of those markets. Now the professional film market is dead, dead, dead. (By professional, I mean commercial photographers) So it's unlikely that we will see much in the way of pro-quality film cameras, especially instant, in the future. The pro-sumer market is pretty dead too. The photo enthusiast, the go-to guy in the family for pics at weddings and reunions, has got a Nikon D60.
It's the art student with the tattoos and weird haircut who's locked in his bedroom messing around with weird cameras and film. (Hey, that's me!) It's a market, but not a huge one.
I have to point out that the Polaroid integral packs required solvent coating capablitiy as well as aqueous coating capability. This was due to the integral nature of the pack which required a hydrolytic shutdown procedure of a base in water dissolving a water impermeable membrane and releasing an acid.
Therefore, in view of Ilford's (both of them) past history, I doubt if either company could coat solvent. This means a real R&D effort if my guesstimate is true. I wish them good luck!
This is not going to be easy to re-engineer or redevelop.