That's why most GPLv2 disclaimers state: "[...] under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version." While this doesn't protect you from any new "bogus" GPL-versions, it at least insures compatibility with later GPL versions such as GPLv3.
Well, this is rather a good move from the fsf peole, not very different from what's used with software versioning. Ideally you want to have everybody using the latest stable version of everything. The GPLv3 is not bad at all: http://blog.milkingthegnu.org/2008/04/gnu-gpl-for-dum.html) when you think about it
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