i don't think there is any statistic to back up your claim there about the wintertime. 50% of the population lives in the sun belt, which accounted for the vast majority of population growth in the last twenty years, and will absolutely continue to do so for the next 20 barring some sort of massing geopolitical shift. the majority of the population already lives in places with relatively mild winters. note that this doesn't even include high-bike-ratio places like portland, boise, seattle, etc.
is it a lot of fun to ride a bike in the snow on the way to work? absolutely not. is weather something that justifies considering a bike a summer-only toy, unsuited for year-round use by "the vast majority?" no. that's just you extending your personal circumstance to the rest of the country. i never "park" my bike. i ride exactly the same amount all four seasons.
and even beyond that, it doesn't even track that snowy winters prohibit cycling. in helsinki, finland, 20% of all commutes to work and school are by bike. 58% of the population travels by bike at least once a week. yes, usage is lower in the winter, but it's still an order of magnitude more than in most of america's cities, temperate or cold. the way things are is not the way they have to be!
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