My reference point is electric cars. They were a complete non-starter, all but physically impossible because the energy density of batteries was so incredibly m

My reference point is electric cars. They were a complete non-starter, all but physically impossible because the energy density of batteries was so incredibly much lower than that of gas. Then batteries got better, and hybrids came out that had dramatically better mileage than ICE cars. But they were expensive, and looked weird, and electric cars still weren't possible. Then electric cars came out that were expensive, and low range, but pretty viable for city driving. But the range would never match ICE cars, and they'd always be to expensive. We're now at a point where the infrastructure and economics hasn't caught up, and the range is still arguably a little low for super long road trips, but once we get working fast chargers saturating most transit corridors, and once we get cheaper, smaller cars offered, we'll be pretty much there. From "The physics really just don't seem to add up" to "Well they're a little pricey" in, what, thirty years?