Sorry I'm late to the topic. I started reading the first few pages but will have to start again later.
Anyhow, maybe this point is already made somewhere in here, but... Although the majority of EV's today have combustible batteries, non-combustible batteries do exist. And as far as I understand, even Tesla is trying to develop non-combustible batteries. For an example, they bought out Maxwell Technologies, who have already developed a solid non-combustible electrolyte that promises denser, lighter, longer lasting and cheaper batteries that do not combust under any circumstances.
So in the future there is the possibility of having the choice of buying an EV without anything combustible in it. In fact there have been plenty of EV's, especially from DIYer's that have had non-combustible batteries such as lead acid, NiMh, and LiFePO4.
As far as I understand you can't make gasoline non-combustible. Even if you could, then it would be useless.
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