Ummm. What circles do you run in? I'm nearly 35, spent 6th grade through 5 years in college playing in concert band, marching band (we usually did musicals every show), jazz band. I've got Hamilton on repeat, have seen Les Miserables, Phantom, Jekyll and Hyde, Beauty and The Beast Musical, West Side Story, Grease, Oklahoma!, Guys and Dolls all live multiple times. And I've NEVER seen Singin' In The Rain. I've seen clips, but never the movie or any stage production all the way through. I work with teenagers for the very nature of my job, and most of them have never even HEARD of that one, let alone seen it.
For goodness' sake, how many arguments are there going to be on GMR? I didn't like it, but I know others who did. Do we really need to convince random strangers if it was a good ride or not? I could see arguing if it was a ride that still existed, but it doesn't. If you're glad it shut down, good for you. If you're sad it shut down, good for you. Who cares. You won't convince anyone that your opinion is right on the internet.
It boils down to this. Star Tours underwent a major renovation years and years and years back to make it a ride that was no longer the exact same thing every single time, and to update the graphics for it. If even STAR WARS couldn't survive its original ride structure and movie, why would we ever be surprised that GMR got shut down? I'm honestly surprised it didn't happen a decade earlier.