alanbates, although i agree with you that keeping a stress-less environment is essential, that is not the solution to ich. ich (cryptocaryon irritans) has been studied thoroughly and absolute cures have been found more than a decade ago. it has been posted in many scientific studies. just do a google search and you should find a few easily. the ich stickies on this forum take from these studies and provide short and useful summaries of the ich life cycle and its cures. relating ich to herpes simplex is not a valid point as a cure for herpes has not been found to date, but that should just be a matter of time. the same goes for AIDS as well, hopefully.
we all have heard stories about people trying the proposed methods (hyposalinity, copper, tank transfer) to cure ich but did not succeed. In those circumstances, there's usually something during the treatment that didn't go right. Ich treatments require very rigorous protocols. The salinity needs to be held constant, the copper dosage needs to always be above the therapeutic level, there should not be cross contamination between QT and DT, etc. With the right protocols, ich is actually very easy to cure. Leaving the DT fallow for 10 weeks is guaranteed to let all of the current ich strands to go through full life cycles and die (i can't speak for mutations that could possibly happen in the future).
you challenged MrTuskFish to completely eliminate ich. Well, he has done that for many many years, and so have most of the experienced aquarists on this forum including myself.
You also mentioned the stress of removing fish from DT into QT would induce an ich outbreak. Yes it probably would, but since you're treating them, why does it matter? Also why do you think a person can "manage" a stress-free environment indefinitely? A simple power outage without a portable generator could lower the temperature and increase the stress level dramatically, and this is something you can't control. in fact, the recent hurricane in the northeast caused lots of tank crash, some of which were actually caused by "managed ich" killing stressed fish in the tanks without power. This happens often enough in the past that we do not recommend managing ich, but rather curing it. all it takes is one stress factor that you cannot control or predict to allow ich to go rampant in the tank.
in short, ich cures have been found and proven to work. i have cured at least 20-30 fish of ich in the past. it is very easily done in a QT when you buy a new fish (since your filter only needs to supply one fish's load), but very hard to do once you have a DT full of 15 fish. This is why we recommend QTing every new fish and treating it before it goes into the DT.