Think about that for a moment, you are trained as a mechanical engineer. You know about motors, transmissions and all the complexity involved in creating a combustion engine car, like handling fluids, pumps and so on.
Now, you are going to take a decision that destroys engines, your new cars are not going to have engines. Transmissions are extremely simple or do not exist. The entire car does not need to resist the forces of the engine and transmission. No pumps and brakes last the entire life of the car.
This means mechanical engineers are not needed, and you already have them. Under German law, it is extremely difficult to let them go, and they are your pals,btw.
The infrastructure of cars is extremely expensive, several 1000s millions of dollars per plant. This is amortized in decades. If you buy a thousand lathes that make pieces for 20 years and after 10 years demand for those pieces disappear... your lathes cost at least double.
But the most important thing: Germany is good making mechanical things, but not the leader in batteries or electronics, Japan, US, Taiwan and China are.