So, one thing that people seem to miss is that there are two Moore's Laws. Everybody knows about the 1st one, but the second one is as follows:
> says that the cost of a semiconductor chip fabrication plant doubles every four years
https://en.wikipedia.org/wiki/Moore%27s_second_law
And I fear that's what's going to be our stone wall in the evolution.
Yes, building the most modern plants make sense. But producing more of the older generation chips also make sense (don't think all the stuff in your phone is the latest generation neither!)