WADR to the people at the FSF. Any interpretation of a license is meaningless until it goes through court. Judges and juries decide what the license means, not the FSF. This is where the arguments stem from, other people have lawyers and legal experts and they are rightly telling them that a court can rule any way at any time for any reason. The FSF telling people that this is the only interpretation either means they are confused or lying. The legal system is a lottery.
At best the FSF can tell you what the license is 'meant' to mean but obviously they haven't yet closed the gap between intention and actuality otherwise we'd only have one GPL.
This is why a new license needs very good reasons before being brought in. We are trading a battle tested GPLv2 for an untested GPLv3.
Not that I told you so or anything but some one by this same pseudonym was right all long about the March 28 thing and so was and who was not grandfathered.