Pretty sure both Z and DMS are extremely busy/overwhelmed and I wouldn’t expect that to change any time soon for either one. So by all means fantasize all you want. But if you actually want to change things you’ll have to act independently. If you want an improved HiFiGuides, create one. Then get M0N to bring it to Z’s attention. If Z likes it he can replace the existing Guides with the new and promote it. If you want a wiki, build it. Etc.
The advantage of doing something independent of HiFiGuides is that it wouldn’t need Z’s buy-in to go live.
(BTW: I volunteered our services re HiFiGuides on a thread that DMS and Z were actively responding to not too long ago but got no response: DMS on Linus tech tips