I think this reflects well on Mayer's distrust of yahoo's HR department. Even though hiring employees from only prestigious universities is a terrible decision when it comes to getting as much good talent as possible, it's the only "solid" solution to force HR to at least be hiring candidates who might almost be good at what they're doing.
The reforms taking place in yahoo are quite interesting. Mayer's probably running under the knowledge that most of yahoo's employees aren't really good at what they do, so it's going to be very interesting to see what kind reforms she can pass so that the quality of the work produced by yahoo doesn't correlate with the quality of employees they're currently dealing with.