First, the OGL is likely not irrevocable. I've seen many people saying that, for some reason, Wizards of the Coast cannot revoke earlier versions of their license; that the license, once put out, can never be taken away, and that people and companies can keep making content for 5e forever.
I do feel it is necessary to point out that one of the architects and authors of the license (previous VP at WOTC) stated the opposite. Further FAQ posted by wizards in 2001 actually says that they can revoke it but also states that writers could ignore Wizards and continue to publish on it if they did.
Finally, there is a Lawyer who did a you tube video on one of the D&D podcasts. He actually wrote a PHD thesis about the OGL back in 2019. He stated he was not sure what revocation even means and that the license exists, WOTC can choose not to release further content under it but can not stop other creators from doing that.
Based on what this guy said, is what WOTC can do is not release further content under it (like they did for 4E) and instead release content under this new OGL 2.0 or whatever.