I agree with you Mike. I think people DO use the 3200 stuff, but the shelf life of that film is pretty crummy, which works against it.
While it sucks that TXP might go away, at least there are other options for ISO 400-ish B&W films, even from Kodak (400TX and TMY). But TMZ... that's it from Kodak. And there is only one other film on the market that is comparable (Delta 3200). That's what made me sad about HIE.
RE: TMZ in the fridge. I found it fogs eventually. Don't plan on buying a 10 year stock.