I think in the director's commentary on the DVD, they mentioned that whenever a movie tries to predict the future it's always wrong. So to try to prevent people from expecting power laces and dust repellant paper in 2015 they decided to make the future as ridiculous and kitchy as possible and to just have fun with it. They didn't care about potential inaccuracies.
Still, it's hard for me to accept that 2015 is just 5 years away and that we still don't have flying cars.
They weren't expecting 9/11 when it was written. There's no way in HELL they're going to give Ahmed Ibli-Muzzieneighbor a flying car, and since THE LIBERAL AGENDA won't let just some people have them, NO FLYING CARS FOR ANYBODY.