I would like to know that too, since all the worst case scenario I can think of is also defining aspects of permissive licensed projects.
For example, a community could fork a project and license it under a new'er version, and then the original founder could suddenly want to incorporate the new changes but at the same time not want to use the new license, and the new community refuses request for a license to the old version. I don't think it ever has happen with a gplv2+ project, and it require a quite hostile community to begin with, but as a worst case scenario that would likely be it.
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I would like to know that too, since all the worst case scenario I can think of is also defining aspects of permissive licensed projects.
For example, a community could fork a project and license it under a new'er version, and then the original founder could suddenly want to incorporate the new changes but at the same time not want to use the new license, and the new community refuses request for a license to the old version. I don't think it ever has happen with a gplv2+ project, and it require a quite hostile community to begin with, but as a worst case scenario that would likely be it.