I think battery production is a limiting reagent.... however, just a thought here....

Do you think most of the people who want(ed) a hybrid already have one?
Maybe the demand is softening a little?

I do see fewer and fewer newcomers to sites like these...

I think the exponential growth is no longer there...
Also, I don't think Hybrids are a mystery anymore.
I have to explain my car to ever fewer people.
( I still get a few who confuse hybrid and flex fuel... so I want to make my hybrid a true flex fuel... then I'll cover all the bases. )
-John