There's a freedom to giving up the need to own experience. If the thing you'd like to watch stops being available, well... watch something else. And probably be richer for it.
On an individual level, you can make your own decisions. From a cultural level... hell, no. There is no freedom in letting other people make all your decisions for you. Maybe you like living in a disposable society, but not everyone feels the same.
The number of films I'll see again is probably down to a dozen or so.
Yeah, but which dozen? It's not that everything is important and worth preserving, but today you may not realize how important something will be to you in the future. At the rate things are going, we are moving towards a society with 0% ownership of everything, so you won't even have the choice of re-watching one movie, let alone a dozen. Even if you don't care about owning things, you should support other peoples' right to do so.
I've barely deleted anything in the last 40 years, from my Amiga games to all my e-mails to all the music and artwork I've created. Why? Storage space is cheap, and I'm good at keeping things organized and easy to find. I've thrown away the physical media for a lot of things, but all the content is totally under my control on local storage. There's no way I'll rely on someone else's cloud.