I think you're wrong. The concentration is for a host of reasons. Witness the large number of cities and countries that have tried to create a local Silicon Valley competitor unsuccessfully over the last 25 years.

The data centers I think prove this point, and disprove yours -- huge spend has gone into data centers, but places like Wenatchee remain stubbornly not Silicon Valley.

Intel has not made Portland into SV. Austin, while a tech hub and one of the US supply chain centers for hardware, is multiple orders of magnitude less productive than SV for tech startups. Productive as in numbers of unicorns, total value creation, however you want to spin it.