The question was about the present, not the future. Maybe Musk will be able to lower the price of batteries in the future, but his current price is pretty much what I said. What he has achieved is to make lithium batteries about as cheap as existing consumer batteries, not even as cheap as the sodium-sulfur batteries that power companies use at the moment, let alone what is necessary for widespread deployment.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.