What you are saying - to put it in finance terms - is the $7500 a year fuel cost (using the numbers above) is a hedge/insurance policy that is worth it to you - in contrast to people who just want to have an extra $7500 a year to buy more razors or whatever . The other approach that would be the best of both worlds is to put the first years $7500 in savings into a whole house generator - an insurance/hedge designed precisely for that contingency and now you get to save $7500 a year (for all future years) and you have peace of mind with regards to your storm / emergency issues.
For most of the US the plugin hybrids are the best of both worlds - working on electricity for daily grocery / commuting trips and a conventional gas car for long hauls all built into the exact same car.
I think at present, it would be foolish for car manufacturers to NOT start producing hybrids with some style and storage.
It's a "ready to roll" technology that bridges the gaps on both sides of the discussion.