The idea of swapping batteries comes up from time to time, and I used to be a big fan of the idea as well. But over time, I've developed a lot of doubts. It adds a significant amount of complexity, it adds logistics challenges, and it adds significant cost.

The alternative is more chargers in more places and bigger batteries. Chargers are actually pretty cheap, especially the 50 KW chargers (or less) that work well as destination chargers at offices, hotels, restaurants, malls, grocery stores and other locations. Increases in battery capacity directly lead to vastly greater #s of miles per day with lower charge times.

Swapping just isn't necessary or economic.