@dos @dpk well the joke is that it's as permissive/lax of a license as the most permissive/lax license in effect, but most lax licenses aren't lax because they can be relicensed, they still ordinarily operate under the terms of the original license, unless there's a specific clause for relicensing
But GPLv3 "or later" has the challenge where you have to trust the FSF, and that does have that challenge (and I did mean to evoke thoughts about that)
License upgrade stewardship is a tough problem