Look, it's all very well to talk about leaving, but the reality is if you have a product to sell, a business to promote, if you want to keep up with what's going on in your communities, physical and virtual, if you want to connect with people at all, you've got to do it through the hellscape of social media. There are no other options. Everyone's locked in. If you want to do something involving people, you've got to go where the people are.
It's a catch-22. Social media won't die until all the people leave, but all the people won't leave until social media dies.