Spock's knowledge of the future has become moot for a large part...
Not with regards to the weird, powerful supernova 130 years away.
Not with regards to the coming of the Borg.
Not with regards to the coming of V'Ger.
Not with regards to the coming of the whale probe...
He can warn Starfleet to stay on their side of that wormhole and save a lot of lives in the future.