I think ICE cars are just not optimized for prolonged life. Many countries have policies discouraging long lifespans, more than ever since emmissions laws. Also, EOL for a car is several owners and 5-10 years removed from first purchase.
This adds up to a realtiy where doubling the expected lifespan is not worth much more, in sales.
Basically, if Tesla want to make this a goal then beating benchmarks should be relatively easy.
x2. Modern vehicles have a targeted minimum lifetime based on certain usage models. That's why people who are driving a pickup truck around all day for work with a few hundred pounds of equipment (e.g. medical equipment service technician) get 500k+ out of them and oil field trucks are beat before 100k.
This adds up to a realtiy where doubling the expected lifespan is not worth much more, in sales.
Basically, if Tesla want to make this a goal then beating benchmarks should be relatively easy.