Are we assuming that everyone is always going to be biking with no other options? I don’t think anyone is even advocating for that.
BUT WHAT IF YOUR LEGS ARE BROKEN? WHAT IF THERE’S A NUCLEAR WAR???
The people who seem to think that biking is an untenable option because you might have to very occasionally use other modes of transport make me wonder if that mindset comes from the fact that people feel that it’s normal to only use one mode of transport pretty much ever, because that’s how many people are with cars.
If there’s a nuclear war I’d rather be using the decentralized, free to use mode of transport that is bikes. Or legs. When the war comes all the car drivers will run out of fuel in a couple days and have to steal it, but I already have a bicycle and cannot be stopped by the breakdown of society.