Assuming that combustion engines will exist in 2999, Chevrolet will probably use synthetic fuels. It is likely that a future Chevrolet would balance affordability with technological advancement. Expect a reliable and practical vehicle with a focus on fuel efficiency or alternative energy sources. Maintenance would probably be digital and a subscription.
Potential issues could include wear and tear on suspension components, brake systems, and basic mechanical parts. If Chevrolet transitions to some subscription based system, you might have to switch the car. Hopefully, this can be avoided.
Future WOF inspections might focus on structural integrity, brake performance, suspension condition, and the functionality of core safety systems. Hopefully, they will focus on all subscription based hardware.
Given Chevrolet's historical focus on value and reliability, a future model should be engineered for longevity. Issues would likely revolve around wear and tear on high-use components, rather than complex system failures. However, cheaper sensors or even subscription maintenance could affect the car's lifespan. Keeping to the old ways of Chevrolet could be more useful.