I think that the gearing issue is exactly that - an issue. Electric motors with their linear and huge torque from 0 rpm and the wide rev range make a one-gear-car very attractive to the manufacturer. Of course, the top speed will suffer. But as soon as the hammer falls for having a gearbox, the whole thing becomes much more complicated, no matter if it's just a two speed. You have to deal with the huge torque and with the fact that you need to rearrange the whole drivetrain in order to have the motor deliver its power to the gearbox and not directly to the propelled axle(s). In times of ICUs and cars working exactly like that it shouldn't be that much of a problem, but still you're dealing with extra weight and many more things to go wrong on a system which can be as easy as most EVs are. Still, I personally believe that an EV with a two or three-gear-gearbox should be possible, at least because it's very easy to reduce the torque of the motor in the lower gears.