Seems to me that a few years from now, most road bicyclists will be riding Carbondale carbon-fiber frames with the Kingpin feature. The rear of the frame flexes to make a rear suspension while the rider weight in the seat dampens it. The system could only be quirky if the rider was out of the seat while hitting bumps. Well, maybe the seat post could have a hydraulic lever to lock it in place when needed.

Of course we already have flexing forks. The trick is that steel is okay for flexing and carbon-fiber is okay for flexing. Of course steel is very historical while carbon-fiber is relatively new.