I liked Idiocracy too, but it's not actually happening. There are plenty of papers that indicate educational outcome, the most popular metric of intelligence, is actually a function of educational environment. There's no evidence of our declining intellect, there's plenty of evidence that we're getting smarter, and most of the counter-arguments are based entirely on class discrimination.
Yes! Humans have hyper-selected for intelligence, just like how peacocks have selected for a huge tail. Intelligence is the most attractive characteristic in a [male] partner, but it's hard to see if your criteria of intelligence are heavily biased. i.e. your high school's star quarterback may not be as good at math, but he's socially competent.