Market forces
What will probably happen (if it's allowed to sort itself out) is that most people would charge such cars overnight or over a few hours (I think the average customer would find even a two-hour charge much more attractive than overnight, particularly for commuters.) I haven't done the math on how much less power that would require--I suspect it's more complicated than simply dividing out the numbers.
There might be a few scattered one or two port "Rapid Charge" stations when someone really, really needs a fast charge, and would pay a much higher price for it.