It is not yet time for the Mariners or Nori Aoki to make a decision of whether they should agree to stay together for another year. As per his contract, Aoki and the Mariners must mutually agree to want to be together to remain a Mariner.
There is also the potential, as Bob Dutton of the Tacoma News Tribune reported a couple days ago, that Aoki could reach a plate appearance threshold of four hundred and eighty. Doing so would give him a player option as opposed to the mutual option.
Of course, (depending on his plate appearances) Aoki has the power to help or hurt his chances in the final thirteen games.