The problem, of course, is mismatched incentives for the middlemen versus the clients, particularly at the margins. Similar to real-estate brokers. They may be effective in many ways, but they are looking for pareto-efficiency, where they get you 80% of the match (or 80% of the pay) or whatever for 20% of their effort.
It's hard to imagine any incentive scheme between buyers (hiring managers) and sellers (applicants) that wouldn' be subject to the same market mechanics, even if at lesser scales when done through more automated means.
I don't think crypto really has anything to do this.