Traction control is already banned and was last year (and possibly previously). Now, while I like carbs and mechanical fuel injection, I'm not sure how you intend the cars to run without at least one electronic component, as even banning electronic ignition and going back to the more traditional points and condenser setup found on most road cars in the 1960s and 1970s would still require an actual condenser (which is a capacitor, an electronic component).
Could always ban the cars from having a battery and alternator to keep it charged (those have electronics as well) and make them use magneto igniton, or I suppose making them all use diesels would work, don't need any ignition for those.
Or did you not mean ALL electronics? Doesn't matter what the rules are, the teams will find a way to spend money to make the cars go faster.