Right now plug-in cars are mostly pretty expensive (e.g. Tesla). The primary market for them seems to be people who are wealthy enough to own single-family homes or townhouse style condos in urban environments, where it's easy enough to add a charging port in the garage or on the side of your house. What do people propose doing for charging infrastructure when plug-in cars move their way down the price scale, within reach of people who rent apartments and have to park on the street far from the nearest electrical outlet? Even if you're lucky enough to rent a place that has an off-street driveway spot for your car, good luck getting your landlord to add anything like that. Or are there going to be "public" charging ports that exact exorbitant rates for charging your car, creating yet another way in which being poor is expensive?
Without a good plan to provide equitably-priced charging infrastructure for the masses, the whole thing bears a distinct whiff of champagne socialism.