It's the same problem with kicking out artists in a dilapidated warehouse area, and moving in boring professionals to live in lofts built on the same foundations: your renewed neighborhood loses all the reasons it was appealing. In Boulder already you cannot really afford living in town with a service industry job, but people who want to work in Google also want to go out and have a beer after work. Those service industry workers need to commute into town, which is time-consuming, adds expense, worsens traffic, and lowers their quality of life.