The USs biggest problem with EV isn't a lack of products. All the big three have EV or PHEV vehicles in their lineups now and they are all really great cars, especially for their price.
The real problem now is infrastructure. Public charging places, charging for apartment dwellers, hell even most older houses only have 100A (or less) service, and some don't have the option to upgrade (or the upgrade is cost-prohibitive).
You could look at the lack of electric trucks, but trucks here are a status symbol for a certain demographic, and the last thing on that demographics mind is controlling greenhouse gas emissions. Most of them don't even believe anthropomorphic climate change is real. Until that is fixed, there's barely any market for them in the first place.
At this point we need sticks. We've dangled the carrot of the federal EV credit. Now we need a big tax for new fuel vehicle registrations. Let the the tax scale inversely with EPA MPG. Put that money towards investing in grid upgrades and subsidies for home and multi-dwelling building improvements to better support EVs.