That's open to pure speculation (for both of us). Nero was able to somehow calculate where Spock was going to show up, even though Nero went through the wormhole first - and I would venture a guess that Spock, the Vulcan scientist, is smarter than a Romulan miner. Whether he could pull it off or not is also speculative. I still maintain that it's out of character for him not to try. He doubted he could built a tricorder interface device out of stone knives and bearskins in order to save the future, but pulled it off anyway. As for causing more damage to the timeline... the planet Vulcan, 47 Klingon warships and six (or seven? don't recall) Starfleet ships have been destroyed... hard to muck things up worse than that. Not to mention the possible future that's now been created... one possibility is a rapid militarization of the Federation and the Klingon and Romulan empires... or the Romulans deciding to attack when they discover the Federation has been weakened by Nero's attack (and is in fact now missing one of its key planets and all its resources). If it were me, Earth had been destroyed, and I had Spock's intelligence and capabilities... you bet your britches I'd be slingshotting around the nearest star/heading to the Guardian of Forever ASAP.