It's an interesting idea but these things have never taken off in the past. I'm speaking from a UK-centric position here, but there's a pretty strong ethos that guidebook creators should get paid for the work that they do and there's also a responsibility attached to a professional guidebook that doesn't exist on a crowdsourced platform. UKC can only take you so far, and 25 quid for a copy of whatever SMC book you need is hardly onerous. Any donut can add "Shit Chosspile E8 6C **" to the UKC database but if it's in the SMC book it's probably worth having a look at.