How much green space is ideal for a livable, sustainable city?
It seems like park space is not necessary at all if the city is vibrant enough. If there are enough things to do, parks are not really missed. (I'm talking about large parks covering several acres)
Parks could contribute to sprawl by forcing development elsewhere rather than inside the city.
If the city is sufficiently compact, the countryside is within easy reach of everyone. If the city is sprawling, access to the countryside is restricted which increases the need for urban parks.
Are large parks even necessary at all in a well-planned city?