We don't need to convince everybody. Even just convincing 10% makes a huge difference in shifting the conversation, infrastructure, reducing energy usage, etc.

I live in Montreal and winter cycling used to be a really hardcore thing. Not anymore. Winters are warmer now, just a bit, but enough to make winter cycling pleasant on most days. Dedicated, snow-plowed cycling lanes made a huge difference.

(I use my car most of the time, because usually a daycare run with kid, but now we're equipped for maybe once a week by bike)