im with kaiser here
electronic would be the future
small electronic stepper motors would be able to move the mech fractions of a mm every time where as hydro is not quite so accurate and could be fine tuned quickly through your lap top (as long as the manufacturer supplies it as a open system not locked so you have to go to official repair centre
also i think the electronic way would weigh slightly less and would be easyer for internal routing of wiring
For mountain bikes? Bikes that take a knock in use as part of their purpose?
We are going to be tuning them from laptops???
Electrics have their place I am sure, but for day to day running I think it is best to keep it simple.
Hydraulics could be light and nicely adjustable on the fly. Much more reliably so than cables. Also could work against a spring so no need to run a loop.
However, all of this is leading towards bikes needing more expensive tools and more expensive servicing and repair.
For me, cycling should be as simple as possible.
As long as it is not single speed.