In the olden days you could not stop some children from reading, and parents could be heard telling their kids 'don't stay up too late reading', as if it could be a problem. For many, school holidays was when a lot of reading happened. Lord of the Rings would need a summer, and much literature was required to be part of the 'in group'. This would start at a young age, much like how eight year old kids need Roblox to be part of the 'in group', there was a time when it would be something such as reading everything by Roald Dahl, C.S. Lewis, Tolkien or, more recently, J K Rowling was important, with each age group reading their own thing, not prescribed by adults.
Parents also used to read books, not because it was what you were supposed to do, but because books were not competing against Netflix, computer games and general doom scrolling.
As well as reading novels there were books and magazines crammed full of information. For me it was the atlas that could be studied for hours, nowadays, why would a child with a geography obsession do that when they have Google Street View on their tablet?
In the former times there were two types of houses, those with books and those without. That was the true class divide. Not everyone was reading for pleasure, plenty didn't read anything more than the newspaper, which was near-universal in every home.
We also had books sold for a penny that were the AI slop of the times.
All considered, I think it is a bit silly worrying about the kids not reading books when so few adults are reading books themselves.
Many people worry about children not reading enough but when you look at the parents they're all on their phones.
Monkey see monkey do. If you want kids to read habitually then you need to read habitually.