@Ukland Wombat
Suggest reading The Innovator's Dilemma and Crossing the Chasm for a grounding in this kind of topic. I'll simply say that this is not just a matter of retooling, not even close. The cost of lay-offs, legal and picketing battles with unions that would ensue for the right to make engines. The costs of the liability hangovers from pensions to warranty and recalls to debts on written-off engine manufacturing equipment previously counted as assets, balance sheet debt in general that would be in default, settling supplier credit lines for exhaust pipes etc etc plus lawsuits for lost business, dealership and customer lawsuits, environmental clean-up and on and on not forgetting the fact that Ford as a going concern is legally obliged for good reason to sell its products through franchised dealers, plus the retooling MINUS the fact that the entire share price of the ICE maker is based on projecting sales to consumers that are now no longer interested would put the cost of the transition of a company like Ford beyond reach - multiples of the value of the company as it stands and many multiples of the value of a company that is no longer a going concern. Just ridiculous compared to letting it go belly-up and buying the useful bits from bankruptcy for pennies on the dollar without any of the hassle including no need to deal with the old management or its culture - probably even get tax breaks for years just for offering to re-hire a quarter of the staff.
It may seem to you that Ford or Toyota is a big powerful thing but without customer interest in what they are set up to make they are absolutely powerless. That is what a tech disruption is. The word "meh" from enough consumers is insanely more powerful than Ford or Toyota. Ask Kodak - the companies representing digital cameras did not attack and kill Kodak, the consumers simply said meh to Kodak's photographic films and Kodak was stuck there with a load of machines for making photographic film. That's what killed Kodak.