If there's still some competition in the car market, then any single manufacturer can break this whole plan by going low-cost, capturing market shares just by not playing the bundling game.

Actually, the un bundling has already started with EV: you pay once for a car and a few cents per Kwh (and, when self-driving comes around, just a few cents per miles), and voilà: no more expensive fuels and car maintenance, and no more war to fund either.