>I'm not sure why anyone would need to worry about that fact
SV is famous for solving problems that impact SV or cities like SV. Whenever I hear the question from startup/techie folks "are we in a bubble", I always think the answer is "yes, but not how you think". We're not in a bubble of too many high valuation startups, we're in a bubble where we don't understand the rest of the world around us. Because we're living paycheck to paycheck on a $250k salary in a $5k/mo studio apartment getting our food from Postmates and having drones deliver our Amazon packages. And after a while, you start to think that's just how it is. But it's not. Not for the vast majority of people who don't live in SV, Austin, or Seattle.
That's the value diversity brings, that's the danger of suburbs everyone's been talking about since forever, and that's where the Bay Area is going. Quickly.
The closest Whole Foods to me is over an hour and a half away. Until last year, the closest Trader Joe's was over 3 hours away. I work in tech making six figures, and my neighbor (living in a detached, single family home) is a diesel mechanic. The guy on the other side owns his own home but just works as a cashier at the local grocery store, because our cost of living isn't ridiculous and you can afford a house on $12/hr. Even myself, I recently got schooled when I said $65k/yr doesn't make you rich: the number of people popping out of the wood-work to say what making $65k would mean to them and what luxuries it could afford them was astounding. Just hitting $65k would double most of their income.
We don't have Uber around here. We don't have Postmates. Amazon doesn't deliver same-day. We can't get Google to drop off our groceries for us. Our employers don't have a bus to take us to work. Some people may say "but all of those luxuries are the reason why we moved to SV!", but in response I say all of those luxuries are reasons massing together in SV is so harmful. First, it colors our worldview to think our life is normal. Secondly, it ignores everyone else in the world and the real problems they have.
I'm not even talking about segregating races and ethnicities. I'm sure there's plenty of diversity of skin color and ethnic background in SV. But there's a lot more diversity that exists than the ones the law says you have to respect. And their problems aren't being solved by people in SV, because people in SV don't even know they exist.