They continue to operate. Mondragon has 80,000 worker owners. And yes, it has a challenge in recent years where the worker owners have created a class of non-owner employee. But it got pretty big before that started happening, and there's no reason to believe it wouldn't continue to function just fine if that wasn't an option.
There are many other worker cooperatives functioning very well at scale with zero non-owner employees. My proposal is essentially that we make this the requirement. That any business formed must be formed as a democratically run worker cooperative. This is perfectly actionable. Governments define the legal structures under which businesses may form today, and continue to regulate those structures. Right now, those structure enable the investor ownership relationship, and most worker cooperatives have to use those structures and bend them to allow the worker ownership relationship. It's a relatively straight forward legal matter (with wide ranging consequences) to change that structure.
> No banks, no loans, no credit cards. No way to protect against inflation with financial instruments as basic as a target-date fund.
Like I said, this is a thought experiment. Not fleshed out. And it's not the same as the proposal I outlined above for a worker cooperative based democratic socialism. I don't think you actually read my post, I suspect you just skimmed it and then reacted to certain sentences.