Why would they need to fork? WordPress itself is from B2, hence its licensing being GPL. WordPress cannot adopt the dual licensing of other A/GPL software companies like Cal.com because it's not even their copyright in the first place. Therefore, all WordPress changes must continue to be GPL. The only parts that might need to be replicated are things that are not necessarily part of the core codebase, such as the plugin repository, but it seems people are already starting to move towards a decentralized model for these.
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Why would they need to fork? WordPress itself is from B2, hence its licensing being GPL. WordPress cannot adopt the dual licensing of other A/GPL software companies like Cal.com because it's not even their copyright in the first place. Therefore, all WordPress changes must continue to be GPL. The only parts that might need to be replicated are things that are not necessarily part of the core codebase, such as the plugin repository, but it seems people are already starting to move towards a decentralized model for these.