The issues with the current disc brakes for road may not be issues IMHO:
1. disc brakes are pretty much all standardized on flat-mount front 160mm rear 140mm setups, so I wouldn't too concerned about the standard
2. hub spacing of 100mm front 142mm rear thru-axle is pretty common, and I think most will adopt to that. Again, i wouldn't be too concerned that
On top of that, disc brakes allows you to get light weight carbon aero wheels without having to worry about the brake track issue. In a sense, you can invest in wheels for a longer term
I think hydraulic disc is definitely a game changer, and will only get better. I will only be matter of time before it's available on eTap shifters.
But the thread is about this guy's bike, how he rides and where he lives...
1. I'll bet the current rim brake standard is around longer than the current disk brake standard - hell, I'd argue there isn't even a standard yet.
2. Again, the dust hasn't even settled yet - yeah those are the current common spacing, but there is certainly no indication it will be like this long term.
You can get lighter AND more aero wheels that are rim brake! This guy lives in Florida and rides his trainer when it rains, so I don't think there is any concern about keeping a nice set of wheels long term.
Most of my bikes have discs, but I wouldn't call them "game changers".