Why collect movies at all?
Anything a few months old is on demand digital HD.
I don't understand people who collect movies... do you ever repeat watch them?
The only people I know who repeat watch movies are children.
I think some people see a movie in the theater and have a wonderful experience.
It really sticks out in their minds due to the size and sound and adrenaline rush.
Similar to other drugs, they want to relive the experience.
The experience is gone and will never happen again with the same movie.
It's a waste to collect movies.
Collecting movies is no more a waste of time than collecting baseball cards, guns, cars, computers, or whatever else someone may collect.
For me, I'll often just wait to see a movie until it comes out on Blu-ray because I can buy the Blu-ray cheaper than my wife and I going to see it at the theater. For example, we didn't get around to seeing Inception or Insterstellar in the theater but I bought each for well under $20 (I believe Interstellar was just $10). Yeah, maybe we'll end up not liking it enough to watch it again and again, but it still was cheaper than going to the theater and I can add it to my collection on my Plex server and who knows - maybe we'll watch it again.
Additionally, just because something is on Netflix or Amazon now doesn't mean it will be there forever, so I will purchase certain movies/shows even if they're on Amazon/Netflix (especially if they're on sale). Band of Brothers/Pacific, Star Trek, Game of Thrones, etc. are examples of this. And yes, we do rewatch many movies as well.
OP, stick to Blu-ray and build a Plex server and rip them to the Plex server so you can stream them. You can set the quality of the rip and it will look better than coming from Netflix or Amazon.