I'm not sure if wireless shifting will ever become standard. I have an ebike with di2 and I haven't noticed any reason I would want it over regular shifting. You also have the problem that if the battery goes flat you cant shift gears.

One of the big reasons for electronic shifting counter-intuitively applies to “daily riders” more than to race machines, even though at current prices, electronic shifting is rare on affordable bikes.

That reason is that once you have a solenoid, sensors, and a CPU in the mechanism, you have a self-adjusting shifter. The more gears on a derailleur-type system, the tighter the spacing, and the sooner a mechanical shifter needs adjustments or replacement of the cable.

Electronic systems can adjust themselves as needed, offering a massive potential for affordable bicycles to “just work” for people who don’t have the inclination to fiddle with their own adjustments.