Yeah, it would be very hard to create safe and spectacular electric rally cars, while electric motors are very powerful, create gears, who reduce torque means no good on gravel, reduce top speed - always on "rev limiter", and etc.
Rally should be with cars with combustion engines, but it's more political thing about green energy and whatever. I'd be ok with R5-ish rally cars as top category in case of green peace activist campaign against WRC rally cars, as long as it be internal combustion.