You're still left with the problem of where the power comes from.
While EV is a fringe technology it is easy to have a few running about. But if 20% of cars were replaced with EVs you'd need to find a lot more electricity than is available now.
Most countries don't have surplus electrical generation and indeed many already have a shortage.
I hate to be so pessimistic when it comes to new energy sources, but I do not see the viability /benefit of a recharging system that requires interchange of an energy storage vessel. Would anyone feel safe with energy tanks that may present a safety hazard? The mechanism that would allow a quick interchange, would be very likely the failure mechanism during collision.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.