One other comment that I think bears mentioning.
All previously-distributed GPLv2 software is still GPLv2; it doesn't magically stop working or relicense itself.
So at the end of the day, the response to folks who take the "oh noes, the people who write software we get to use and modify for free may, at some point in the future, change the terms of new software they write after that date!" attitude come off as if they are complaining that their free pony doesn't come in the color they want.
Nevermind that the alternative licensing schemes (eg BSD, Apache) could just as easily end up in the same situation, with future releases licensed under different terms. And historically, that's precisely what tends to happen as the tragedy of the commons unfolds yet again.
Honestly, I just don't get it. :)
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