Another hope is the increased use of big data in recruiting. Whereas previously, employers used crude heuristics such as which university you went to, they now have access to constantly improving algorithms which pick out precisely which applicant features that predict productivity and which don't.

So, we don't need big data. We need the data we already have, that we're legally prohibited from using. What you're going to find, for almost any job, is that g matters a lot, and then conscientiousness and extraversion matter some, and job-specific experience and training determine how quickly they can become productive. If prospective employers could just look up your IQ test scores, they wouldn't need to sneak around trying to estimate your IQ score from available data.

(Edit: of course further research and testing will determine other things that matter. But we shouldn't pretend that we don't know the biggest factor, or that the gaps are knowledge-based instead of policy-based.)