This will come and it may not be a bad thing. Looked at across the decades, it is no surprise.
Car ownership became (relatively) cheap in the 1960s and has recently become much more (relatively) expensive.
My grandfather: 1892-1982. Soldier and bank employee. Never drove. Never owned a car. Never wanted to.
My father: 1921-1996. Soldier and economist. Drove all his adult life. Company car from 1948 to retirement. Own car thereafter.
My maternal line followed a similar pattern, but with car ownership starting a generation earlier.
Me: 1960s to date: Bought 1st car at 18; owned one ever since. Keen cyclist, but always a driver.
My eldest child: Born 1993. Drives, but has no ambition to own a car. It's not even in her thinking. Keen cyclist.
My younger children: Too young to drive, but not particularly interested in learning. Both keen cyclists.
I'm not sure it's a case of anyone 'starting to win'. Motorists and cyclists are very often the same people.
Sometimes, cyclists would be motorists if their finances or priorities allowed it.
There is no critical mass in this calculation, literally or metaphorically.