I have always had mixed feelings about silicon valley expanding into San Francisco -- I felt there was a strong negative impact, though to some degree SF acted

I have always had mixed feelings about silicon valley expanding into San Francisco -- I felt there was a strong negative impact, though to some degree SF acted as a honey pot for those just interested in money. I wonder if this will be a harbinger of a retreat or shrinking of the size of the overall "tech" sector, or if it will remain a one-off. I guess that when the blockchain and ai bubbles really burst we'll see. They have a higher concentration up there for some reason.