People are on their phones because the slop they are being served is so shallow and meaningless that they can't be bothered to pay attention to it
No, I’m pretty sure social media has seriously hurt the average person’s attention span.
The idea of sitting down and watching a two hour movie is really quite daunting when you’re used to videos that are at most 30 min and often less than one.
This people though has been catching up on a century of classic films. There are plenty of lists around on the internet if you wanted to get started. The AFI Top 100 is a gentle introduction to the (American-only) classics. There are deeper cuts when you are ready to saddle up for "1001 Movies" instead. (Warning, you could be starting down a journey that will involve the next eight years of your life.)