With so many e-bikes popping up, with extra cargo space and even seating for 2 people (electric rickshaw bikes), I wonder if we can go full circle and bring back old cars like 2cv or Model-T with significant speed limits of 30kmph and reduced safety requirements. More and more european cities are starting to have 30kmph speed limits.

To people already preparing to explain how ridiculous that idea is, I know :)

It's more of a pipe dream. Just physically makes no sense to carry around 60kg of an ultra lightweight car (estimate taken from lightest Shell eco-marathon prototypes) instead of the 40kg of the heaviest ebikes. Not sure if there's any feasibility wiggle room.