It just depends what you're measuring against. USD has definitely suffered inflation but other currencies have also. You could also measure against gold, some basket of currencies or whatever you want. One measure sometimes used in the UK was the Mars Bar as its value was somewhat stable over time (that may have changed though).
However, if you want a stable measure, as always, 1BTC=1BTC.
You threw out a lot of smart ideas, and then your last sentence 1BTC=1BTC makes no sense (even though a lot of people say some variation of that in order to attempt to mean something like only BTC matters, which is surely a known logical fallacy even though peeps still get pleasures out of saying that).
Of course, there could be a measure in terms of hookers, Lambos and blow, and/or Big Macs... which makes more sense than 1 BTC = 1 BTC.