Gasoline cars used to offer ranges not so much more than 400 kilometers, only very modern and Diesel cars increased that number significantly. Elektric cars have reached (and in Tesla quite exceeded) that range. More improvements will happen too. But a > 1000 km range isn't what is holding electric cars back. I actually think, few electric cars will ever reach that range, unless there is some crazy breakthrough with batteries, as it makes more sense to have smaller and cheaper batteries than optimizing for an use case which doesn't matter much.