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I think the impetus pre-dated that. The employees of peninsula companies were living in SF and commuting. As they spun out of their big co's to start stuff, they opted out of their commutes. YC accelerated the utility of very small "offices" aka "lofts."
There was definitely already some pull in that direction, but the moment the center of gravity shifted was when Stripe and Pinterest moved from PA to SF, and both moved somewhat against their wills because they couldn't find office space.
FWIW, Stripe didn't move to SF just because we couldn't find office space. At that point, we were still quite small (about 20). There was quite a bit of push from staff within Stripe to move to SF because the staff was young, and SF was where the action was!
In fact, I remember losing a few recruits because we were in PA and not SF, which helped us make up our minds. If being in PA was making us lose on talent, it seemed like a bad idea to stay there long term.
If you look earlier than that, it was the big co's that had to open offices in SF because talent demanded it, not because they couldn't take down more buildings on the peninsula. Google kept buying/building more space. But, young talent wanted to be in the city where the fun was.
The elected leaders of San Francisco have certainly wiped out any perception that SF is where the fun is.
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