Someone asked me to specifically write about what services would be lost with EVs, so I am going to list them (not comprehensive, but broad enough):
Services related to air intake and emission: intake manifold, intake systems, throttle plate cleaning, change of filters, sensors especially O2 sensors, exhaust emission system, catalytic converters, particulate filtering, exhaust pipes. The impact covers diagnosis to parts replacement, so the air intake compression tests, exhaust emission tests, even turbo systems, would be rendered redundant.
Cooling system: no more radiators and cooling jacket tests, no need for temperature sensors and tests, water pumps, belts to run the pumps, no sales of coolants. What's left would be the cooling system for the batteries instead.
Ignition system services become obsolete, so no more spark plug replacements, no glow plugs, no starter motors, no alternators. There are no more carbon removal on piston rings, fuel injection system compression tests and calibrations, no more engine components machining. Services for engine lubrication becomes obsolete. No need to worry anymore about gasket leaks, getting under the car to check for oil leaks. The entire electrical system for ignition is also obsolete, and away goes the diagnostics too.
Services relating to fuel delivery system, starting from the fuel storage (in the tank) to dispensing. No more worry about fuel pumps malfunctioning, fuel gauge not working, clogged fuel lines. Even EVAP services are eliminated.
Diagnostic system becomes obsolete as EVs become fully computerized. No more OBDs. No more memorizing of codes.
Even wheel system services are reduced. Take for instance brake pads, due to the regenerative braking system, brake pads take much longer to wear out. Parking brakes become fully electronic. 4X4 systems are replaced by motors on all wheels so there is no more transfer case and related servicing.
Workshop operators, when they see this list, becomes nervous, because they find that most of what they are doing today will soon become obsolete!