The Hunter’s Point spot is crap. There is no access, the site is polluted (and will still be after cleanup) and the entire mess is still within the San Francisco city limits which means it’s a liberal nightmare.
On top of that the entire area, including the current park, is about the highest crime area in the bay, second only to Oakland.
The 49ers will almost certainly move to Santa Clara, even if they have to buy an amusement park to git ‘er done. SF should have been off the table years ago.