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At least, for now.
If we can figure out a way to produce large amounts of low-cost electricity, for example, then a plug-in hybrid would be a beautiful thing. And if the cost to buy these things can be reduced to at least somewhere close to the current cost of a standard compact sedan -- in the low $20k range or so -- then even better.
But until one or both of these conditions is met, it's hard to make a dollars and cents case for hybrid cars, plug-in or otherwise.