I'm surprised it's not more of a thing to have a CLA that allows relicensing only to another OSI-approved license. I don't see many examples along those lines[0]. And the "OSI-approved" wording would allow a project to freely switch between MIT/BSD/GPL/etc or even create their own license (as long as they get it OSI-approved) without having to hunt down past contributors for permission.

I would never sign an open-ended CLA, though. For all I know, the project (with my code in it) could end up being bought by Oracle, proprietized, and used by Larry Ellison to construct the Torment Nexus.

[0] https://en.wikipedia.org/wiki/Contributor_License_Agreement#...