I feel like, just for their own sanity, Naughty Dog needs to take a step back with their next game. Make something lighter. A new Jak game or something.
Part of the crunch is obviously studio culture that ND needs to work on, but a big part is that they're stuck in a loop where every new Naughty Dog game has to be the BEST MOST GROUNDBREAKING GAME EVER, or it's not worth putting out. Rockstar is stuck in the same loop. If you're stuck in that mindset, no extra development time is going to help, because you're going to still kill yourself trying to perfect everything.