I suppose I have. What has been suggested here by Mike and Andrew was not a modification of the GFDL to an updated version, but suggesting that some sort of community vote could happen here that would simply ignore that the GFDL even exists, and simply replacing the default license on all Wikimedia projects to something like CC-by-SA.
I think you are simply wrong there. I don't think anyone has suggested that. I don't think anyone disputes that that would be illegal.