I would like to see emerge a car-buying agent. The agent would deal with all manufacturers and used car lots (still a need for this) and help the buyer get exactly what they want at the best price.

However, there will always be some new car retailers because some people like to buy new cars in person and drive them immediately. I think the standards for sales staff will continue to change away from the old commissioned, "pal" model to the new non-commissioned, quant/car nerd model. It is a change that seems to be defining this generation of workers.