Are they kidding? Since 802.11_ protocols are 'smart' in the sense that wifi nodes exercise congestion avoidance with other nodes running the same protocol, the next wifi standard just needs to be allocated dedicated space in the spectrum, rather than having to share the same narrow common space with baby monitors and AV extenders. Alternatively, the band of less-regulated spectrum needs to be expanded wide enough that manufacturers can create some informal standards to avoid stepping on each others toes.

(And yes, trust me, I know why this is politically difficult, and that it wouldn't immediately help the enormous number of users with current-generation hardware. But really, their recommendation isn't likely to make much short-term difference either.)