The problem is EM owns the place now and can do what he wants.
As much as we want people to leave Twitter, we can't force people to leave. If they decide to stay, despite the misinformation, there is nothing we can do about it. Personally I have zero people in my life who use twitter and I have never used it either. So I cannot actually influence anyone to leave.
In the end, you cannot save people form themselves.
To me it would be better for all news outlets to leave than for them to stay.