In fact, some other non-traditional transports might tempt your Flintstonian fantasties if the HumanCar doesn't put you off:
Good If You: Want A Workout
The Trikke (from the Lykke Li school of double consonant spelling) could be pitched as the HumanCar for people short on friends: it's a one-man "carving vehicle." Row, lean and twist and the Trikke goes forward, turns and stops. It looks a little funny, but it beats walking.
Good If You: Don't Fly Too Close To The Sun
Cost: $1 million
MIT's Aeronautics and Astronautics Dept and NASA teamed up to create this human-powered aircraft about 20 years ago, setting the world record for a human-powered flight (71.5 miles over 3 hours and 54 minutes) when Olympic cyclist Kanellos Kanellopoulus flew from Crete to Santorini under his own power. Four times per hour he radioed reports of the conditions (he was sweating profusely inside the 70-pound, enclosed craft) and almost made it all the way. Winds at Perissa beach on Santorini tore the plane apart, leaving the Olympian to crash into the sea. The crash put an end to the $1 million project but had no such effect on the festivities given in Kanellopoulous's honor later that evening.
Good If You: Seek A Giant Step For Mankind
These super stilts fall into the category of powerbocking (the original idea was cooked up by altitude addict Alexander Bock, from Germany), which could be described as the coolest and most dangerous way to walk. Strap the spring-loaded stilts onto your lower extremities and leap your way to the grocery story in a matter of minutes. I'm not sure how you'd get the eggs home, though.