Is that really it, though? I mean, that seems really weird on its face... "I'd like to own my own copy of this movie rather than just stream it, but I really have to get back to hating Republicans." That doesn't seem all that plausible.
Personally, I am happy streaming things I don't care to own. At this point, most of the things I watch, I want to watch once. The world is so abundantly overflowing with good video content that I have little reason to return back to something. Those few things, I frequently will buy. Some of my "season DVDs" I'm quite glad I hung on to... some of them were on Netflix for a while, but are no longer, and are still fairly expensive to buy.
If the stream services went away, ultimately I'd be slightly inconvenienced.
Music, by contrast, I tend to listen to a given track/album that I like quite a bit, and I take possession of. YMMV. I'm very music oriented compared to most people.
And Stallman's arguments about software are yet again something different; there are reasons for having the source and using open source that have no media equivalent, because software isn't just media, it's a machine.