- Often don't have cars at all, and have to walk that much longer to get across all the parking between places they want to be
- Spend a large portion of their incomes on cars, maintenance, fuel, insurance etc. when they even can
- Are required to live further away from productive places by the high cost of e.g. minimum parking requirements and low density ceilings "because traffic"
- Suffer the brunt of air pollution
Parking in a central business district should probably be as much of a luxury as living in one is today, and vice versa.
It’s a solved problem, look at European cities like Amsterdam, Paris, Barcelona, Madrid, and many more... But in America robust public transport never gets done for many reasons including that special interests don’t want it to.
And somehow making that number scale with income makes that better?
The point of raising the price accessing any shared asset is to optimize usage of that asset. Otherwise you end up with private enterprises like non-street parking lots eating the profits with nothing going to the rest of the people.
If you don't want non-street parking lots to funnel in all the profit, then you provide efficient and wide-spread public transport.
The real alternative is jacking up the cost of parking to the point where there’s always an empty spot.