In most actual occurrences of red spots or fading, the specific sources of contaminants cannot be pinpointed. In addition, HVAC equipment can fail, or not be maintained for lack of funds. The longer we expect the film to last, the more time there is for slow processes or corrosion to occur. We always were told that proper processing was the main issue in archival permanence. Now you are saying that corrosion of silver is the key.
Proper processing is still important, everyone agrees on that.
That the corrosion idea is correct is supported by scientific publications from all the major manufacturers and by independent researchers who analyze actual examples of deterioration in film collections. Kodak and Fuji are aware of IPI's research but do not specifically endorse SilverLock treatment of microfilm. However, the idea that gold, sulfide, or selenide treatment increases permanence is officially recognized by all manufacturers. Yes, Kodak Brown Toner can successfully be used. IPI did a parallel series of tests that showed it to be effective.