[mseebach]

If you're doing prudent financial planning, you have to assume close to zero. The technology is moving very, very quickly, and there's no telling what it will look like in five years and if your present-day car can be retro-fitted to fit into it.

[henrikschroder]

It's not unlikely that breakthroughs in battery technology could be retrofitted into present-day electric car. I can totally imagine that 5 years from now you take your Model S to the shop, and replace your battery with a new and improved with 3x the range. It wouldn't be cheap, but cheaper than a brand new car.

[mseebach]

Sure, I'm not claiming that it's impossible. But what if the technological breakthrough is a sustainable way to mass produce bio-fuel?