I can fathom no world where you'd want to trade away a multi billion dollar brand for a new brand you literally can't SEO. What, you think your brand is gonna be more impressive that the generic variable, and a part of the alphabet?
"Follow me on Twitter" becomes "follow me on X"? "You should tweet that" becomes "you should X that"? The little blue bird on every shop window, website, and business card becomes a stylized letter that, hopefully, doesn't look so threatening on the next iteration?
It's a textbook case of brand destruction. I almost regret never making a Twitter in the first place, just so I could quit today, or at any of the hundred days in the past year where it got inexplicably worse without reason.