If they made a purely electric car with a range of at least 150 miles between charges I'd be very interested. I hate the whole idea of electric cars but you cannot deny that it would be nice to never stop at a fuel station.
I however will never buy a dual electric/petrol car. Twice as many things to go wrong and twice the repair bills. I have a feeling they are actually worse for the environment because they require more energy to produce, contain some nasty chemicals in the batteries and are likely not have a long life span.
The price to repair dead batteries + gas/petrol engines will quickly exceed the value of the car itself once it ages.