The news about IBM's caches is very interesting. Surely the rest of the manufacturers will be eager to get their hands on one of the equipment to analyze the result, if it works well, we will surely see it in a few years in AMD and Intel processors for servers.
Regarding the prices of the components, taking into account that the machines necessary for advanced manufacturing processes are becoming more and more expensive, it is normal that they tend to rise, and we will stretch the devices more. I remember when at the university, in 98, the professor of the subject that explained the physics of semiconductors warned us that mosfets had only a few years left, and that miniaturization was going to be more and more complicated.
More exotic materials, more complex transistor designs and with more stages of manufacturing... all of that is going to make it complicated for us to return to the times of high-end graphics cards at 500€ and mid-range at 150-200€. I am very pessimistic about what is coming in the medium term in our hobby.