The benefits of FOSS are specifically tied to the freedom to run and fork code for any reason. If you get rid of that model, you lose a huge number of attractive features of these licenses: freedom is the benefit of FOSS.

There are already tons of source available models that tons of companies use. Nothing is stopping you from putting your code on Github right now with a proprietary license. Of course, even in that scenario most users prefer single-time purchases to subscription models.

If you want to go off and develop a new proprietary subscription license, then fine. But don't market it as a solution to OSS problems, that's deceptive.

> All of your suggestions ultimately boil down to altruism by commercial entities

Quite literally none of my suggestions boil down to that, I deliberately left donations off the list. In every single model a commercial entity pays for something they would not be able to get for free: advertising, permission to bypass GPL infection of their own code, support and access to developers, new features, or an enhanced proprietary version.