GNU GPLv3 turns 10
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It also spurred a lot of rewrites of GPL software. This has been good for the most part, but the opposite of what the FSF intended.
Perhaps oddly, the only software which I know is currently open source thanks to the GPL is Linux, as I imagine there might be more Linux distros that are proprietary (or at least, the kernel would be) if it was not under the GPL. That said, I still license my own software under the AGPL if it's something big or something I'm particularly proud of. The rest goes under public domain (CC0).
Version 2 is readable by mere mortals; simplicity is a feature.
I was also surprised by the boilerplate "version x or any later version", seems strange to give away something under terms that don't even exist yet -- and I'd be interested if this actually weakens the assertion of the license.