Electronic Shifting On a Downhill Bike

The guys at Madison have fitted the Shimano Di2 electronic shifting system to the Saracen Myst downhill bike. You might have seen the Di2 bodged on to some xc bikes previously but this is the first time the DH prototype shifter has been used.
Obviously a load of testing needs to be done on the durability the device for downhill use, but could this be the future of gear changing?