Electronics won’t be the Achilles heel of old cars. Gasoline will be. But make no mistake. Old electric vehicles with their max 10-year life span of battery banks won’t enjoy the life of a classic either.
step 1. prepare a usb with files needed to jailbreak the car and be able to connect to your wifi
step 2. setup a home network with dns/ntp and a reverse engineered tesla server that will authorize the car to work
step 3 set date to reasonable values that the car will accept
step 4 do some button dances to start the car from the usb
…
ill leave the rest to your imagination
Older cars are simpler, both in total, as in the requirements to retrofit replacement parts. Your average machine shop/etc will be able to keep that 914 running for the next hundred years. And when they stop selling gas, you can convert it to run on everclear.