The Ceramic Speed looks very interesting, but they certainly make grandiose claims without showing any proof they have a working bike with such efficiencies.

They claim to have been track testing, but I find it very suspicious that there's no video of this, and none of their mock-ups have shown an actually working shift mechanism.

As far as materials technology advances leading to greater efficiencies and easier maintenance, there's no reason in principle that won't apply to chain-drive as well--chains may look very different in 20 years.

Technologies seem to develop faster when there are competing lines of technologies, so I'm rooting for shaft drive to advance, but I remain skeptical that it will be anything other than a niche for quite a while. People with poor wrenching skills, like myself, will likely steer clear of it for a while because we wouldn't know how to deal with problems, and think it would likely be a very expensive prospect to find someone who does. .