Tom, naturally you are correct. Generally as technology evolves, that includes technology to reduce production costs, thus lowering the price of the product to the end consumer and opening up new markets by price level...
So yes, this is true of anything technology related... TVs, phones, cell phones, DVD/VCR, computers, etc.
I was thinking more along the lines of perishable commodities, which is where the airline seat market is headed... Are oranges as cheap as they were in 1978? Milk? Grain? Clothes/fashion? Like I said earlier, the only consumer commodity that I could think of where the price had not changed was gasoline... And that is something that may be undergoing a fundamental shift currently.
Even some items, which arguably are technology related, have not been reduced in price over the years... aircraft and automobiles... Even PC's seem to have bottomed out around $500 in the last several years, as now the price cannot continue to decline because of the additional technology required to "keep up" has replaced cost-reduction in computers (in the last several years anyway, I am sure computers are cheaper now than 1978.)