"Culturally significant" is the wrong metric, and shows that you don't really understand why people watch what they watch.
People watch all sorts of things, from all different time periods, because they enjoy them. Sometimes those things are "culturally significant", but I'd expect that's not the most common case. Sometimes those things are B-movies from the '70s or brain-candy sitcoms from the '90s.
The premise is that there is so much good AI content that if you just pick something you enjoy, no other criteria, 90% of the time it'll be an AI work.
The only people that would be watching a significant amount of older work are the people that have a reason beyond that.
The back catalogue will have a few scattered gems that you can find amongst the sea of mass media that appealed to its audience at the time. Most of that content no longer relates or makes sense to us. There's also a massive load of dreck and garbage.
People should be realistic about this instead of emotionally invested against AI as the news media has tried to sway this. It's just a tool, and artists are starting to use it productively.
It’s also a silly to believe that because it’s old it’s culturally significant. There’s plenty of ancient dross in the back catalogues.