Sure, once trained, every usage technically lowers the cost per usage. Once trained...
The comparison was made with the graphics engine team at Microsoft who were writing the first version of DirectX at the time when then-current hardware could just about do 2 frames per second. The sentiment apparently was along the line "why would you bother?" By the time the release grade stack shipped, hardware had caught up and 30 FPS was commonly doable.
We should expect to see similar step-change improvements over time, as the algorithms are refined and hardware further adapted to the new bleeding-edge constraints. In a way we already are, because apart from the frontier models ballooning like crazy, the "regular" class models are becoming more capable in smaller sizes.