I'm not convinced that's an example of your point -- "[RMS] cares about his copyleft philosophy and GPL dogma more than the ability of free software to use free software". And some parts of the blog you pointed us to are simply wrong, like saying "[GPLv3] doesn't work for end-user software" is also wrong in that that's not true (there are many GPLv3, GPLv3+ -- GPLv3 or any later version -- and even GPLv2+ programs intended for users to run) and mischaracterizes the underlying issue. The heart of the issue has to do with understanding why GPLv2 licensors won't switch to GPLv3 (which would be fine but risk revisiting this problem again later) or GPLv3+. Furthermore, this is hardly an intractable problem, particularly among copyright holders who want to look out for their users' software freedom.
As http://gplv3.fsf.org/rms-why.html rightly points out, "both GPLv2 and GPLv3 are copyleft licenses: each of them says, “If you include code under this license in a larger program, the larger program must be under this license too.” There is no way to make them compatible.". So LibreCAD could relicense to be either GPLv2+ or GPLv3 which would allow making a program with code from LibreCAD and code from a GPLv3 program. Asking a GPLv3 or GPLv3+ project to relicense under a lower version GPL would be heading in the wrong direction for preserving user's software freedom. Asking the FSF to do a worse job of defending software freedom is a silly thing to ask.
GPLv3 has substantial practical improvements over GPLv2 which all GPL licensors ought to consider. A few examples: nicer termination terms than GPLv2 -- under GPLv2, any infringement causes a infringer to lose their rights under the license unless the copyright holder(s) restore those rights. GPLv3, on the other hand, grants an infringer some time to come into compliance to account for accidental infringement. GPLv3 has anti-TiVOization, anti-DRM, and patent licensing language not explicitly present in GPLv2. GPLv3 has a more modern source distribution requirement than GPLv2 (which was written before Bittorrent). Again, as http://gplv3.fsf.org/rms-why.html rightly points out, "Further advantages of GPLv3 include better internationalization, gentler termination, support for BitTorrent, and compatibility with the Apache license.".
http://gplv3.fsf.org/ has complete details on GPLv3's advantages and http://gplv3.fsf.org/rms-why.html concisely states multiple reasons to switch to GPLv3. There are plenty of good reasons to license under GPLv3 or "GPLv3 or later" to avoid this problem in the future.