I think it's a symptom of something else: the hyper-centralization of relevance and cultural center of gravity in only a few places.
When I was younger (1990s), I don't remember it mattering so much where you were located. I've spoken to older people and they concur: they've all said that when they were young being in, say, Indianapolis or Toledo was not a big deal.
Today, at least in the USA, there's a strong sense that you're nobody unless you are in one of about eight big coastal cities. Nothing happens anywhere else.
I'm talking about perception here. You can argue that this isn't really true, and that you can do anything most anywhere, but the cultural perception is that you're nobody and can't do anything unless you are in NYC, SF, LA, etc.
I'm a startup founder and have been told by several people on several occasions that we are doomed because we are not in the Bay Area. I'm in SoCal but apparently if we're not in SF or its Southern suburbs it's impossible to succeed as a tech company. Obviously I don't believe this, but the meme is strong. If enough people take this stuff seriously, it's going to contribute to a hell of a property bubble in SF/SV.
I still don't understand why this is the case, especially since the Internet was supposed to have the opposite effect. By making information globally available and communication easy, the Internet was supposed to flatten the world and make place less relevant. Instead I've noticed a strong and obvious trend in the opposite direction since circa 2000.
I can only comment on the USA, but what I see elsewhere seems to support this being a global thing. London has gone totally insane for example. I wonder if the Internet is actually having a paradoxical centralizing effect here, allowing larger cities to broadcast their cultural "signal" and then have that signal amplified enough by network effects to make them appear exponentially more and more influential. This in turn drives a feedback loop in which talent and ambition is drawn increasingly to these cities, etc., and the rest of the country is hollowed out.
It's actually part of an even larger trend. Since 2000 everything seems to have gone increasingly power law: wealth distribution, geographic relevance, education, etc.