The current result is that Wil Wheaton has chosen to abstain from a certain social network and an alternative which he had hoped would alleviate the problem.
Suggesting that companies need to deal with the problem leads to an attempt at a technical solution.
Please describe how using an alternative name - that's the technical solution you propose - would sufficiently obscure his identity that he could continue to make posts in the style that he wishes. Posts which, among other things, refer to his acting experience.
Another "practical solution that has been known for centuries" is to describe the problem, as a way to push for a cultural change.
I disagree with your statement that the current result is simply that Wheaton has chosen to abstain from two social networks. Wheaton writes that he is "done with social media" and that "What we used to call microblogging isn’t worth the headache for me. I’m gonna focus my time and my energy on the things that I love, that make me happy, that support my family."
Nor do I see where Wheaton suggests that companies need to deal with the problem. I see "[Twitter's] never going to change, by the way." and "I respect and support [the Mastadon admin's] decision".