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Battery technology will continue to evolve. How fast they can make reliable ones with a denser power storage is still up in the air. There has been some development on higher density and faster recharge using nanotechnology, but it hasn't made it out of the labs yet.
The question you have to ask yourself is: will the car meet my current needs. Just like in computers, the next model will be more capable, and the i3's successor will probably be as well. There are lots of places still using Windows XP and ancient processors. The i3 may look that way in a couple of years, but if it still provides what you need and expect, there's no reason to trash it and buy another...many people do, as the desire for the newest, greatest is endemic to our souls. It's not very good for our economic health, though!
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