I think EV's are on the same maturity scale as any game-changing technology. Blue-ray or cell phones are a decent example, albeit on a much faster timeline. The tech arrives and is a little rough around the edges, but early adopters jump aboard. The tech proves viable and shows potential for profit, so large-scale producers (Ford, GM, etc) get into the game which improves quality while driving down price. This drives more sales and the cycle keeps going round. At some point (when the cost becomes digestible for the average buyer) the new tech usurps the existing, virtually overnight.
My guess is that we are still in the early adopters stage for reasons mentioned above. Once the big boys get into the game, the switch to EV will happen very quickly. I'm just not sure if that's 5 or 10 years away. I think the range is acceptable for the average urban dweller but the price needs to come down by 50%.
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