No idea if Mr. Thiel is right in this decade, but long term silicon valley has lost its main advantage: silicon. The physical business of building computer parts, especially chips, involves a lot of hard science and deep magic and requires a kind of priesthood steeped in that magic. SV's original success was built on this -- it got rich because it is where the silicon priests lived. But now things have evolved so the…
Silicon Valley has not been about the raw production of silicon chips for over 30 years now. It's been about software and design of hardware for at least that long. You're also ignoring the networking advantages (personal, career, and business) that proximity provides. They are not trivial. It's why SV has stuck around post dot-com.
Lazy bas --- err, I mean, damn efficient, well done, old beans.
(Screw the cattle who have to deal with the fallout. Not adding value.)