Google doesn't need to move. They just need to expand elsewhere. Amazon is opening HQ2 because Seattle is "full", and there are lots of smart people elsewhere that they could employ. All the FAANGs should spread out more.
I'm not sure what you're trying to say here. If you'll scroll to the top of the comments on this page, you'll see where I stated the case that NIMBYism is the problem with housing there, and specifically that Mountain View's resistance to denser housing is part of it. I also think that Google and other large companies can expand elsewhere to alleviate some of the housing pressure, as Amazon has already started doing. Google has offices everywhere, but they are tiny compared to HQ.
As far as expand elsewhere goes, google has many staff in many countries and cities all over the world.