This will be neat if it works but really there isn't going to be a huge market for 500+ mile cars vs the cost savings of getting a 300-400 mile car. The exception might be road-trippers and people who do a lot of towing but I suspect that is a much smaller population than people tend to think.
Americans don't buy cars anymore, though; not really. They buy ludicrous gigantic heavy pickups and SUVs. So what we're really talking about is getting decent range into oversized pickups that their owners want to accelerate like sports cars and still have a nice air-conditioned interior even when it's 150 degrees on the pavement due to climate change.
The top 5 on that list are Ford F-series trucks by a large margin, followed by a Toyota small SUV and a Honda small SUV, before you get to the Toyota Camry, an actual car, followed by a Toyota truck.
Americans just really like their F150's!