You won't. Uber is a bit ahead of the game with the whole "Order a car" system, but car manufacturers should by now have realized that they need to be a tech and service company and not just a "goods" supplier.
Hyper-exotics like Ferrari or Aston Martin can rely on driving enthusiasts to keep their brand alive, the others have to get self-driving tech and think about building an Uber-esque service. I can imagine Uber has a strong position of being able to sell their software/service to the manufacturers (the "Get a ride in a Mercedes" app will be the Uber app with Mercedes-branding, and it will run with Uber's servers), for a, say 5%, cut!
Hyper-exotics like Ferrari or Aston Martin can rely on driving enthusiasts to keep their brand alive, the others have to get self-driving tech and think about building an Uber-esque service. I can imagine Uber has a strong position of being able to sell their software/service to the manufacturers (the "Get a ride in a Mercedes" app will be the Uber app with Mercedes-branding, and it will run with Uber's servers), for a, say 5%, cut!