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They would have to increase in energy density many fold to replace batteries, and that doesn't resolve the issue of high power chargers being a huge money pit for owners. In fact, the slower the "fast charger", the more likely an owner is to break even on cost.
I see an application for rapidly recovering braking energy, or a quick boost of power for acceleration. Beyond that, barring a many fold increase in energy density, I don't see much application.
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