It's not exactly the chicken & egg scenario. The reality is that suburban sprawl makes trip distances longer than the vast majority of residents are or would be willing (and able) to ride. Also car ownership is near 100% and cars are convenient because there's plenty of free parking.
It's a very different situation than dense cities where many will prefer bikes to mass transit.
Also consider that the demographics are very different & soccer mom's simply won't be willing to shuttle their kids around on bikes. As it is, in some suburban areas, moms are getting arrested and charged with child neglect for letting 12 year olds walk 1/2 miles home the pizza shop.
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