Satoshi e-mail hack won't directly influence the bitcoin market, because hacker won't find private keys in Satoshi's inbox, hacker doesn't have access to Satoshi's bitcoin wallet.

On the other hand, Satoshi's e-mail hack can indirectly influence the bitcoin market because Satoshi identity might be revealed. People could be satisfied with the info who Satoshi is (crypto-anarchist, God...), also could be unsatisfied with the info who Sathoshi is (some corrupted corporation, NSA, CIA...) and that could influence direction where we are heading.

At the end, if you worry too much, this news is probably nothing.