Bikes in shops will not work either. Walking through a shop with a bike seems extremely unwieldy; you would need much larger space between the shelves. A bike in your hand makes it hard to pick up things from the shelves. A bike does not stay upright by itself when you go to pick up something from the shelves, so you have to park it with that thing that I don't know the English name of. Even then, if you load the bike with a bag of groceries it usually falls over. When you are walking on one side of your bike it's hard to reach over your bike while not falling over. Bike parking space is a non-problem compared to car parking space. No cars whatsoever is unrealistic even in bike utopia. How do you move big and heavy things? No ambulance, no fire trucks?