It is called survivorship bias. For example I can look back to 80s NES games. Some of those games are very good. But I would say 80% of the total catalog were either very bland or just outright bad. Most consumer type goods have this issue. In 30 years we will look back at this time and say 'they dont make XYZ like they used to' then point at the cream of the crop of whatever genre XYZ is in for this year. Just remember the same year that Shawshank Redemption came out so did Leonard Part 6.