Nowadays with so many hybrids out there, including the plug-ins, I'd not really hold my breath for an ultimate demise of the ICE, even though some kinda radical switch from reciprocating engines to microturbines might become relevant in a mid-to-long term due to the multifuel capability enabling them to resort to biofuels made out of organic waste which would otherwise become a pollutant if released untreated in the environment. Plus some weather conditions that lead to electric power shortages once in a while would still render the ICE desirable, not just in order to enable the vehicles to move but also eventually providing some backup power at home.
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