Where I live (not in the US) we have parking maximums, not minimums. A new office development will not get planning approval if it has more than 2 parking spaces per 3 employees (based on some obscure measurement of building capacity). This is to reduce congestion and encourage more environmentally friendly methods of transportation.
I feel like this would be putting the cart before the horse in the US. Failing to put parking in a place with poor walkability and terrible public transportation doesn't seem like it would encourage much of anything.
The glass half full answer is that it incentivizes economic activity to happen elsewhere.