I would love to see some company produce components someone could purchase and replace an ICE engine with to make it an EV. I'm not talking 300 mile range EV with fancy software, etc. just basic stuff like a battery pack sized to replace a gas tank, electric motor and other components, etc. Some kit that you could take a modern-ish Corolla/Civic and turn it into a 100mi range EV which could satisfy a ton of households that have 2nd/3rd cars. Would be really neat to have them be more like PC components than proprietary.
You can do this now. The technology is here. But bear in mind that each application requires a specific mechanical interface, and that's the problem. People swap ICE motors in cars all the time, but they are skilled enough to adapt them as needed.
