The article is trying to give the impression of a vanishing middle class, but the data really don't seem to back it up. It defines "middle-wage jobs" as people earning between $30K and $80K, and notes that the proportion of these has dropped from 52% to 46% in the last few years. But with the exception of students, there's virtually nobody in Silicon Valley earning less than $30K anyway, so I suspect what this really means is that more and more people are earning over $80K, while the number of full-time workers earning less than $30K has remained close to zero.

Good news spun as bad?