Your confusion seems to stem from the assumption that, making a statement is an implicit assertion that most people believe the opposite of that statement.

In reality, statements are often made rather for the purpose of emphasis or rhetoric.

To answer your question: I think that GP mostly wanted to share the insight that the future zig-zags, which is kind of non obvious and a fun thing to think about. People often like leaving comments about interesting thoughts or ideas, even if they are only tangentially related.