We will not see a change until the legal side of it changes, as it is cars are required by law to have a wet cell battery that can power the lights.
Every electric car and hybrid on the market has a wet cell battery that is often charged by a DC to DC converter, not because of cost, but because it's required by law.
Even Tesla has a lead acid battery, charged by a DC to DC converter, that DC to DC converter can handle all of the 12v electrical loads on it's own, but the wet cell battery is still required.
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