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Imagine a fairly priced "off the shelf kit" to convert existing cars:
1) Wide spread adoption of renewable energy, reducing fears of range anxiety, more demand for charging/fuel stations.
2) Dealers can option existing inventory as renewable, possibly increasing sales/profits
3) Would increase jobs/expertise in the mechanic and after market industries.
4) Keeps existing cars out of the scrap yards/land fills. Cut on manufacturing pollution of new cars.
5) Hobbyists and collector car owners could convert their cars as well.
Negatives that kill the idea:
1) Would cut into automaker profits, so I doubt lobbyist support/government incentives
2) Would hurt adoption of new safety features. Insurance companies go womp womp.