If you take the 4x capacity, lets say take a 300 mile current battery, now you have 1200 mile range. If we take 1000 cycles at 50% capacity it is 600,000 miles, way more than the vast majority of cars last, and you still have a 600 mile range. 1000 cycles is a lot and barely any battery goes through 1000 cycles in consumer use.

EDIT: With the 100k mile warranty you are barely reaching 100 full charge cycles so if we assume linear degradation the battery has degraded by just around 5%, which would be reasonable amount for any current EV to degrade within 100k miles.