Continued hardware improvements really make it hard for me to believe token prices will not continue to plummet.
Continue what? The cost per output token has kept going up for the past three years across the board, as thinking models keep leaning more on test-time scaling.
The quality of the said output tokens obviously increased, and arguably increased more than their price, but the price still went up. Or, on the flip side, the price of combined tokens went down (a bit, it did not "plummet" at all though) but so did the average token quality if you count thinking tokens.