Probably nothing to do with decision makers being aggressively lobbied by major car-makers that would prefer to make the easier-to-sell hybrids than full-blown electric cars.
But this is the main problem right? The companies are not allowing other companies to grow, they have done so successfully since a few decades, if they had not lobbied so aggressively, we'd have practical electric cars long time ago. It was purely due to Tesla's brand that Electric cars are now alive. nothing else.