More of the people opposed to gay marriage and pot legalization will have died off, with younger replacements moving up through the political food chain. This will not cause the end of the world as we know it. Most other nations will still ban both.
Hipsters will "rediscover" the .mp3 music distribution medium and will talk endlessly about how much more "crisp" they sound.
The Republican party will have, by ten years from now, finally allowed an electable politician to float to the top of the presidential punchbowl. That politician will be an Hispanic or black female, who will win two terms.
Congress will still be the opposite of Progress.
The US National Debt including interest on loans will exceed the total Gross product of the entire solar system. This will have zero effect on day-to-day life.
Teenage boys will decide to pull their pants up.
Ozzie Osborn will still be a touring musician, but he'll spend more time sitting down on stage than standing. His "thing" will be the Great American Songbook.
Justin Beiber will pull a "River Phoenix" outside a nightclub in LA, and by 10 years from now will be nearly totally forgotten. Females aged 12 to 16 at the time of his death will be the new wave of conspiracy theorists claiming that he really is still alive.
NASA will have landed probes on asteroids, but Congressional budget processes will still have prevented manned landing on Mars. The ISS will have been deorbited, with no replacement. The Chinese space station will be in progress; Russian, Indian and Canadian astronauts will get to visit, but no US astronauts.