Just to compare, this is the utopian dream for Toronto:
There are approx. 18 cars and trucks in that image.
They are taking up SIGNIFICANTLY more space, and are causing traffic.
Still, we keep saying, “give us more of this, please!”.
Insanity or stupidity?
Small quiet trams are generally pretty good for that. They don’t require anything but two rails and overhead wires, and the rest can be as green as you like, as shown by many European cities. Sure, you won’t be able to put it everywhere, or else you’ll decrease safety and isolation, but one or two rails on most crucial sides are an option.