Year over year gains in computing continue to slow. I think we keep forgetting that when talking about these things as assets. The thing controlling their value is the supply which is tightly controlled like diamonds.
Last I checked AWS 1-year reserve pricing for an 8x H100 box more than pays for the capital cost of the whole box, power, and NVIDIA enterprise license, with thousands left over for profit. On demand pricing is even worse. For cloud providers these things pay for themselves quickly and print cash afterwards. Even the bargain basement $2/GPU/hour pays it off in under two years.
From a per mm2 performance standpoint things absolutely have slowed considerably. Gains are primarily being eked out via process advantage (which has slowed down) and larger chips (which has an ever-shrinking limit depending on the tech used)
Chiplets have slowed the slowdown in AI, but you can see in the gaming space how much things have slowed to get an idea of what is coming for enterprise.