Yes, they will follow Google to Sunnyvale or Cupertino or any other of the five to ten towns within a 20 mile drive from Mountain View.
No one is so beholden to their almost indistinguishable south bay suburb that they wouldn't venture across the border to go to work -- these towns are 20 square miles at best.
My original understanding of the post I was replying to was hinting at a much bigger move than 20 miles. Upon rereading it, I potentially erroneously added that context within my own head.
Makes sense, it does seem like they would have a harder time retaining people if they moved to Boise.
That would be pretty sweet if a giant tech company like Google packed up and left Silicon Valley. It's going to take big moves like that to get a real exodus rolling.
No one is so beholden to their almost indistinguishable south bay suburb that they wouldn't venture across the border to go to work -- these towns are 20 square miles at best.