You are right, banning private cars for only a few streets would be a great success for any city.

Lower hanging fruits would be to allow bikes to drive in both directions in one way streets, put some asphalt on cobble stone streets, get an inner city speed limit of 30 km/h, use many zebra crossings, design narrower streets (the narrower the street, the faster a driving person feels, without going faster), remove parking space in the inner city and make cars park outside of the center,…

Many many things that should be done before even starting to try to regulate ‘rude teens on ebikes’ with idiotic ideas presented here (driver license for ebikes?!)

The fast ebike problem would solve itself with an infrastructure that stops favoring cars and starts to seperate pedestrians and bikes with the gained space.