There is no slippery slope. I'll object to step 4. StackOverflow is CC-BY-SA so I'm not that worried. If they try to change that, I'll kick up a fuss or whatever. It's not like fighting this will help with that. Wholly different audiences.
If you don't care, then you don't care. But saying there's no slippery slope? It's capitalism. It's happened with internet providers, it's happened with search engines, it's happened with social media, online stores, it's been funneling into a handful of companies for over a decade now. People want things for free and companies are willing to sell your data to finance their payroll. Saying it won't happen anymore is just naive.
The structure of the Internet precludes universal locking away. I am confident in my ability and that of my fellow engineers to always have alternatives.