I would say it is more healthy and less wasteful. The low price of used cars was never due to any inherent lack of value. It was always due to the market being flooded because the supply was so high. Factors in the last 4 years have corrected that somewhat, but it will drift back to the old state I am sure.
If a car lasts 10 years, and I buy a new one every 3, I'm adding 3 times the pool of vehicles to the used market than demand is going to warrant, and will drive used car prices down.
They were cheap because there were so many. Now there are less and more people want them instead of new. For the time being, the hyper supply has been corrected, and new cars aren't magically twice as expensive as perfectly functional used cars with only slight use. This is really how it should be based on value. It's always that supply has been so out of whack.