Google’s expansion means that Google is succeeding, not the scene around them. Their hiring more people doesn’t increase the number of tech-related companies at all. Maybe the number of banh mi shops will grow. It just means that Google likes the lower cost of running some operations up there.

The scene around might grow and might not. Wannabe Googlers might come on spec and work for a different employer if Google doesn’t work out. Xooglers will be emerge eventually, but if they’re not making googly money, it’s hard to see them staying to work in tech.