Based on an estimate from another Bloomberg article (https://www.bloomberg.com/news/articles/2017-12-05/latest-bu...), the price will halve by 2025. That's 7 years, not quite Moore territory, and we're still talking about mid range or more expensive cars. I'd imagine a $3500 second hand electric car to be 2030+ territory, not quite "a few more years" :)
Currently I could import a crashed Leaf from US auction to my homecountry in Europe and have it fixed and registered for a total of about 8000€, many people do just that. I imagine this will fall to about 6000€ for the first year Leaf imports in the coming couple of year or two.