You know the biggest impediment to concept bikes becoming reality? The UCI. It outlaws anything that remotely looks like it might beat a diamond frame. It's a bit like the FIA imposing Formula One restrictions on ground-effects, turbocharging, tyres and wings... uhhh they did. Must be run by the same bunch of people.
Seriously, there are some fantastic dream machine bikes out there waiting to be unleashed on an unsuspecting public. The latest edition of England's VeloVision magazine has some eye-candy from a recent bike show in Europe. Snap a copy if you can. VeloVision is it if you want to see the future of biking whether in the current edition of those past. Some of the stuff is amazing. Just wish I had to the ability to put some of it together myself.
R