And they are just under one year away from most MCU1's falling out of their warranty period, right? Since MCU2 was introduced in Spring 2018 they likely wait until then before they EOL it. Then if MCU1 fails, it would be a forced upgrade to MCU2 at owner's expense.
Unless my math is off or I'm missing something.
Well the last MCU1 vehicles were made in March, 2018 so they would be in warranty until at least March, 2022. So at least a year and a half. Then there are the cars re-sold with a used car warranty, or where the owner purchased an ESA. So there will be MCU1s under warranty for many more years.