Already they are very popular in China: https://insideevs.com/news/340006/big-in-china-cheap-tiny-el...
What would a Tesla Model 3 look like if it had half the range, no frunk, and much lower performance? (ie. limited to 120km/h) How light, cheap, and small could we take it without utterly abandoning safety?
Basically, the kind of vehicle designed just for inner-city commutes and picking up goods.
If these vehicles became more common we would see a 'peace dividend' in the car safety wars - the other vehicles on the road would be lighter, so crashes would be less dangerous (maybe combined with automatic crash avoidance as well) and breaking times shorter, so crumple zones and other big heavy features could be reduced.