As far as I know this is how places like REI or some groceries work. They are essentially customer owned. I'm not an expert in this, which is why I was asking for advice.
However I believe the board nomination process used to be open, but now only board members can nominate people for a board seat
Given that customers often want to avoid lock-in on any purchasing decision, it seems hard to build a service that has a larger up front psychological and legal commitment. I love the idea of getting bonus points in life for building structures with collaborative ownership, but realistically most people and businesses only want a simple “buy a service that I can cancel” relationship.
That said, I'd love to see someone try it! I think it could work well in a niche environment, or something like a Kickstarter where people feel they helped bring something into being.
I buy shares in the farm per my needs. The CSA takes my money and buys seeds, fertilizer, etc. I get discounted (100% :-) products from them throughout the growing season. They also sell their goods at farmers' markets, do deliveries, etc. My CSA has been growing for years. They're a part of a larger co-op org that spans the NE US, IIUC.
So yes, the "beautiful vision" can be, and is, implemented. Even in tech; I'm sure you've heard of neighbors getting together and building their own local networks because the local ISP won't service them.
I wouldn't say they work well, though, given the state of REI and grocery customer cooperatives.
The main advantage to this is that it gives customers incentive to support the business financially, not just take the assets. You can still have cashflows in way that don't exist in open source models, and around products that can't be open sourced (like loafs of bread, pints of milk, as per the Co-op model).