What might be sort of game-changing here is the idea of using piezo electric shifters. This means that the small mechanical movement of the shift lever triggers a switch but the tiny movement also generates a tiny pulse of electric current which powers the switch and, most important, the wireless shifter transmitter.

This can be a vast increase in reliability because it means that there needs to be only 1 battery for the whole wireless system (or 1 battery per derailleur, if the derailleurs each have independent batteries). Rather than, say, the current etap system which needs 4 batteries. Batteries short out and they seem to fail at the worst possible times, and a piezo electric system can be far simpler and it will always work, no batteries to constantly replace (etap uses disposable button batteries for the shifters, 1 for each shifter for drop bar shifters).

This is a known and tested technology, as one can right now easily buy one of many available wireless doorbell systems that use essentially the same tech, with the outdoor doorbell switch not needing an (external) power supply and also never needing batteries.

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