It's the modern technological economy that produces the political culture of SF rather than the other way around. Marx' idiom of "all that is solid melts into air" is relevant here, tech and the modern urban economy aren't liberal by accident. They're liberal because technology and the logic of economic development itself erodes barriers.
The political and economic divide isn't some artefact that happened by accident and when all the tech people bring their capital and tech to conservative regions they'll see the light and become god fearing Christians, it's the regions that will undergo the same cultural change as any other region absorbed into the modern economy.
it's a process independent of the US or FAANGs. Doesn't matter if you go to Shenzhen, the UAE, Berlin or London. Wherever the global economy takes hold traditional values are pretty much torn apart because they're functionally incompatible.
Non-American Conservatives were much more aware of this than their American peers and are generally much more capitalism sceptic than conservatives across the pond. But you can full on expect that there'll be a very funny new political divide in the US as people start to realise how quickly economic modernisation erodes conservative values. It was already visible in 2016 if you listened to Bannon, say.
Your theory is easily proven wrong. Go to any tech office in high tech China. Notice how barriers have not been eroded, all the managers AND employees are Chinese, and some of the managers are required to be part of the Chinese Communist party. Where is the melting pot of liberalism in high tech China, or India, or Japan, etc, etc.
I've worked and lived in China. If you think China hasn't changed then you should have seen China 30-40 years ago when everyone was wearing the party uniform and carrying Mao's little red book in their chest pocket. And I mean that literally, not metaphorically.
Today you have women running companies, Starbucks and makerspaces in every city where people sit and talk in English. You've got to be kidding me if you think China hasn't changed, it has changed faster than virtually any other place. Beijing (the only city I can personally speak of) has a surprisingly large gay nightlife. It's astonishing how much that country changes even year to year.
Sure, it's not liberal in a political sense yet but it has liberalised dramatically, in virtually all aspects of life. Same goes for Japan, it's a much more open, global country now.
The political and economic divide isn't some artefact that happened by accident and when all the tech people bring their capital and tech to conservative regions they'll see the light and become god fearing Christians, it's the regions that will undergo the same cultural change as any other region absorbed into the modern economy.