Yes, there are billions, if not trillions, of dollars invested in oil infrastructure. But this is one of those times where tense is important. That infrastructure is a sunk cost and so is irrelevant to the discussion.
I estimate weekly US oil imports to be somewhere around $5-10 billion, which strikes me as low for the entire US.
There are other, more subtle, issues. One is throughput (that’s why there are so many gas stations in the US). One of these stations can handle around 15 cars per hour, about the same as one has pump. The problem is that the swap tunnel looks to take up about as much room as 4 pumps. The other is station capacity. A gas station can serve hundreds of cars, and that can be replenished in a few hours, less if the owner is paying attention. A swap station is going to need a lot of real estate to store and charge hundreds of batteries, and when all the charged batteries are swapped out that station is out of service until the batteries are recharged.
