You seem to describe commodities, rather than new technologies that are not commodities. New technologies start so far out on the supply demand curve that an order of magnitude decrease in price can expand the market by orders of magnitude.

The first cellular phone in modern currency cost something like $15,000. At that price, the market for it would be orders of magnitude below the present cellular phone market size. Lower the price 1 to 2 orders of magnitude and we have the present cellular phone market, which is so much larger than what it would have been with the cellular phone at $15,000.

Interestingly, the cellular phone market also seems to be in a period where competition is driving prices upward through market segmentation. This is the opposite of what you described competition as doing. Your remark that the real world is more complicated could not be more true.

Prices going up is only true if you also let the specs go up

If you fix the specs and progress time then the prices go down considerably

Take the first Iphone which was $499 ( $776.29 if adjusted for inflation ) and try to find a currently built phone with similar specs. I couldn't find any that go down that far but the cheapest one I could find was the ZTE Blade L9 ( which still has higher specs overall ) then we are looking at over 90% price reduction