It's not about replacing cars, it's about replacing all those short car journeys. I understand that people are just lazy and take the car for a 1km trip, but with a bicycle you can do the same trip, usually faster. If you don't need to commute to work more than say 5km, then the car isn't your best option, the bike is.
Once you got rid of your car, for those few cases where you need to haul big loads or multiple people just rent a car.
I find it hard to believe that in most scenarios an ebike is going to replace these trips, as weather, cargo capacity and logistics have vastly different impacts. I see much bigger application for people who already ride a bike, and more improtantly have a "bike mentality", being able to extend their range and potential use-cases. This is an important market, but much, much smaller than short car journeys.
