Sorry, the energy density argument is to a certain extend bogus: 80% of the energy in diesel is lost as heat - Carnot cycle is a bitch. :-)
Therefore, with 1/5 of the energy density you would have a battery with the same amount of usable energy, and batteries allow recuperation of kinetic energy, the ICE not, these two aspects give you one order of magnitude.
Hence, for me the affair is not so clear. :-)
But I concur that batteries will play in other fields important role in future, they can replace power plants for auxillary services and flatten the production profile of PV.
The obvious solution is to use millions of civilian EVs as storage, as they have a huge battery which is underused for most of the time. Stationary battery systems at home are IMHO a waste in Europe.
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