The other problem with quickly making new models is repairs.
Yes! Yes! Yes! As someone who has owned 30yo motorcycles that went out of production 30 years ago, and also 30yo motorcycles that are still in production, the difference is tremendous.
Vehicles that have been around for a while have superb parts availability, and a community often develops with a large amount of very specific know-how. Those of you who have not wrenched on vehicles may not realize this, but sometimes the community can be even more valuable than any other feature of the vehicle.