For years we here how hard Stallman is to deal with, supposedly. How it is all about him and he is egotistical etc.
Wikipedia is the crown jewel of GFDL. But - GFDL was really originally written to deal with technical documentation to accompany GPL software, not to deal with content on wikis etc. But it seemed like a good license when Wikipedia started so they used it. There is also a lot of Creative Commons content out there that Wikipedia wants to work with, and the GFDL provisions made working everything together difficult.
So what does Stallman do? He magnaminously allows the crown jewel of using GFDL to move towards the CC world, if Wikipedia wants. Can we imagine Microsoft, or SCO or proprietary licensed software companies doing this? No. And it is helping the digital commons community, although from now on Stallman and the FSF will not being getting kudos for the license for Wikipedia content from now on, because Stallman was so gracious about it.
There is a difference between holding to your principles, and being stubborn just for the sake of ego or whatever. Stallman has always held to his principles regarding freedom. But here is an example of him working with others, and being flexible, to help the greater cause of the digital commons. I have to read for years about how inflexible Stallman supposedly is, here is an example to the contrary. Because Stallman is flexible, he is only inflexible about his principles and about freedom.