Here's why I think this is something most people can do:
I am personally a "native-level" English speaker, having spent 6 years of my childhood in English-speaking countries. I am now in a non-English-speaking country though.
A friend of mine who is also doing this is not a native English speaker, and while his English is quite good, it is clearly not native-speaking level. However, he also manages to watch almost all shows at least at 1.5X speed.
Of course YMMV, but I would encourage people to at least try this out and see if it hurts their enjoyment of shows or not.
I wonder, is it possible to slow down shows for those of us trying to learn a new language who have not yet reached 1X fluency? Assuming it's technically feasible, does it help? I'll have to try that.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.