Magic. I'd love to live in a world where advancements were evenly distributed between technology and magic, so we'd have technology built around magic now. There would be flying broomsticks, and flintlock pistols that shoot bolts of energy, and whenever a wizard sneezes, a gust of wind would cause ladies' skirts to fly up. Sure there'd be no video games or laser-guided missiles or satellite, but who needs video games when you've got magic to entertain yourself? Who needs cowardly modern warfare where you take out enemies who never even see you, when you can throw fireballs at them, summon demons, or carry around swords larger than a car? And who needs satellites, when you can locate things by hovering above the trees on your broom? Oh, and there'd be dragons.
Those of you who've read far into Negima! know what I'm talking about. That other world is pure awesomeness.