I've seen an alternate anecdote developing, one in which talent is growing weary of delivery, social, and data startups. It appears to result from both a financially stable base (engineers having made money from prev mentioned startups) and a desire to have a larger impact.

Additionally, something I haven't seen mentioned elsewhere, but the API availability is unfathomably vast now. I was checking out Google's developer console and there are over 100 incredibly robust APIs just a GET request away. In the real world, you can order drone images, turn off your lights at home, monitor your health levels all from url endpoints. These computational implementations are encouraging talent to work on projects that are beyond the scope of a laptop and a dorm room.

I for one am optimistic in Valley Talent, and can't wait for the next few years.