See above; at best, that's burdensome to the publishers, and at worst it's a legal landmine. Most publishers aren't going to want to walk the tightrope of using multiple licenses at once, which disincentivizes doing so.
Again, if WotC has already released material under one license, why not release the same material under another license? What's the reason for not doing so? If they make a 5E 2024 SRD and release it under the CC, what's their impetus not to also post it under the OGL?
So far no one has been able to answer that question.