I think it is a shocking idea. I have worked in the private sector and the charitable sector and I was shocked by the inefficienvy of the charitable sector, and I don't mean unpaid, voluntary sector, we talking top whack salaries for executives working for charities. But it was still incredibly inefficient. Probably because there is no market imperative driving things. When I was in the private sector, I had a boss who set targets and expected results and no excuses. In the charitable sector, it was amazingly vague, unfocused, no targets, no deadlines (or rather, deadlines would just slide and slide and slide).
Assuming people actually do come forward to volunteer, I fear for the consequences on public services. If you think local services are inefficient now, wait until you've got a load of volunteers running things.
Disaster.
One example: I was working for a charity and we wanted to create a pin that would be sold for a quid (like Mcmillan daffodils or pink ribbon for cancer and loads of other examples). Forget the fact that the market is saturated with pins, ribbons, badges etc., I was gobsmacked about how many meetings were called to discuss and debate and consider the idea. When it finally got the green light, i expected the team responsible to turn up within a few days weeks with a prototype. It never happened. The team was incapable or unwilling to pick up the phone, call a design agency and brief a designer to come up with a little pin. After months of meetings, we missed the deadline to get the pins in the shops and post offices for the season we had planned, good job too, though, cos the pins were not ready in time. The whole thing was chaos.
In the private corporation I worked for, the team in question would simply have been blasted by their boss and told to get a rocket under their arses from day 1. And make no mistake, the delays were not a consequence of understaffing. Quite the contrary. The charity had very well staffed teams, decent budgets, partnerships with private companies and gorgeous offices in a big block south of the river where there are loads of charities.