@SeaMonkey

That is a reflection mostly of the lack of of experience with electric cars - how well do they perform as they age.  Personally, my concern, especially for pure electrics, would be the battery life.  They do wear out or at least hold less charge as they age.  Replacement, if possible (I don't know if that is possible) would be expensive.  It is less of a concern with hybrids since they can still function, though with degraded performance, with a failing battery.  Gas and diesel powered cars don't have this problem - generally the engine is not what is worn out on a car being junked.