> This topic has been coming up on this site for the past decade. Every time it does there are a lot of people who say Silicon Valley will never be beaten.

Perhaps, but another topic that has been coming up on this site for the past decade is, "X is the new Silicon Valley!", and every time it does there are a lot of people who say Silicon Valley is about to be beaten... and it hasn't happened yet. That's not to say it won't ever, but the track record of these predictions since, oh, the mid-1980's is dismal, and I would say they have a heavy burden of proof to show they're not talking out of their asses.