While there is always power in this sort of "yeah, we've always said that and always been wrong!" argument, I still feel that the benefits of computing "power" have slowed to a crawl recently. Which is not to say that computing devices don't improve, they just do so differently; they are better designed, lighter, more durable, have better battery life, etc. rather than running noticeably faster (in fact, we are usually happy to trade "power" away for improvement to all those other things, especially battery life).
This only holds up in the absence of things like Wirth's law and its variants. Not enough people are incentivized to be as efficient (in terms of CPU, etc.) as possible. Device makers are, because it affects their battery life (marketing) numbers, but only in closed systems (like iOS) could we even begin to assume that device makers have much influence over whether the downstream software development is sufficiently resource-efficient.
