The main downside of the Hackerspace is the tragedy-of-the-commons aspect. Lots of tools and toys just asking to be lost or broken. Tends to create lots of rules and dampen the social atmosphere a bit.
If it does work I imagine this is one way to solve the problem.
Noisebridge are true believers in the democratisation of tools - they have workshops and collaborations have at every level of expertise - it is an awesome social good.
Guests were thankful for the knowledge gained and things mostly worked out.