Car dealerships are cooked for a couple reasons.

To start, Tesla is already using the direct model. Car dealerships are a middle man organization that adds to the cost. Remember, cars are going to start seeing downward pricing pressures due to automation and technology. That additional layer is going to have to be removed simply due to economics.

Secondly, Transportation as a Service is only going to get bigger. I expect fully autonomous vehicles by 2023. Give it a couple years for regulatory approval and it will start spreading about the middle of the 2020s. It will start in major markets, eliminating the need for vehicle ownership.

The third reason, is a bit more of a wild card, is the introduction of flying "taxis". It might be further out than 10 years but we will see another layer of car ownership eradicated because of this.

Great point about the deliver aspect of grocery shopping. I didnt mention that in the online shopping equation but it is a big part. Everyone goes food shopping so the market is there. The drawback to online food shopping is the delivery. The grocery chains are starting to address that. I would imagine, as time goes by, we will see it become more popular.