Ed--my apologies as well. I joined in the middle of the thread in regards to inkjet accelerated testing and drifted off into temp/rh space from there.
As I see it though--it's all inter-related. In the end, it all comes back to the environment, no matter how you define it. It doesn't matter if you're talking about platinum prints or inkjets. Given the proper storage for them--even if it means sitting in a subzero vault in the dark--they'll outlast other materials that may be in fact more "archival".
An archive or a museum is pretty much stuck with the material after the fact, unless they commission a piece somehow or can specify the material in use. A gallery that's selling the prints--well, that's another story, and I'm not goig to venture there...
BTW--Ed, no that wasn't directed at you directly....uhm...but more to the whole point of the first post. I was confused about the link to Wilhelm's book--which is a great resource. I couldn't figure out the point of the sarcasm.