It's a matter of time before disks are common on road bikes, there are too few real disadvantages for them to not become common. Maybe they won't become the majority, but they won't stay rare for long.

Sure, changes will be required in the design and engineering of both the wheels and the bike. But they provide too many positives with too much open design space for engineers and designers to work in for them to stay rare.

Sure, you need strong mounts, more spokes, etc...but you can make the rim whatever you want it to be with no brake track, your wet braking is better, you get no brake fade, and with more R&D you won't be giving up any weight at all by the time it's all said and done. Plus any weight you do add can be moved from rim to hub, or even rim to frame/fork.

It's only a matter of time. Those Volagi bikes look awesome, and I think we'll be seeing more like them in the near future.