Biking all year is perfectly possible in most of Germany. There are enough good clothes to counter bad weather, snow and especially ice keeps getting rarer. Biking adoption depends most of the infrastructure and also whether your peers do it too. It has also many positive health side effects.

So? Take the bike when the weather is nice and the car when it's not nice. That still reduces the kilometers you drive by a lot. Nobody forces you to bike when it's 40°C or -20.

People aren't telling you how to live, they're saying that certain current practices are inefficient in a way that causes harm. An extreme comparison would be a murderer-for-hire telling the judge "don't tell me how to live my life, this is a free country!" but that's kinda what that sounds like. You're free to do what you want, yeah... until it harms others.

Individual transportation will always remain an option, but it might be prohibitively expensive for most people to be their main mode of transport when one has to refund the environmental damage it adds.

As for cycling specifically, you and me both as I said here: https://news.ycombinator.com/item?id=36601619 We agree there, but it's not going to be compulsory to cycle...