I've said this before and will say it again, this is the danger of getting rid of physical media. It's also why it's probably important to buy Blu-ray because it might represent the last, best quality of many movies we'll ever see again. Many titles will never see 4k and the streamed and downloaded 1080p versions will be of less quality and may disappear one day.
I did not equate film viewing similarly to the way I like to hear music (as an audiophile) until the past year or so. The only way to get close to what the flim crew intended in the comfort of a family room is to watch blu-ray (physical media) on a top notch panel with an adequate AV processor (for the lossless soundtrack).
I will continue to subscribe to Netflix (physical discs only). Streaming is not ready for primetime, in my view. I imagine that there will come a time when the bandwidth will be there to enable streaming of 1080P blu-ray quality along with the lossless (uncompressed) soundtrack. As for rare content, who cares?! Just buy the blu-ray. Only the most serious, disciplined film buffs could possible find anything to complain about these days.
I've had minor rants on this in other topics here on AVS previously and the withdrawal of streaming licenses is the #1 reason why physical media will persist. I've had the virtual rug pulled out from under me more than a few times now by Netflix and I'm getting to that point where the available selection (quantity always growing, but overall quality always decreasing) isn't enough to justify the continued frustrations with the service. I know it's very much "first world problems" but Netflix seems to have less and less going for it these days. I'd certainly never rely on it to host a movie watching party.
I'll continue my membership (since 97ish) and sit on the sideline and watch all the crap battle out. I will say that , for music I hated low quality streaming, for movies....I dispise low quality streaming beyond words i can post here.
Long live bluray and the next great format of disc (and supporting panel)...me love quality gear.