This is because they are assumed to have narrow window for winning a title. General manager Doug Wilson himself has made the point himself several times over the last 11 months.
It makes it sound as if the team's last chance ever dies with the current core.
One thing that attitude is built upon is Wilson depleting the prospect pool through trades designed to win now. Another is the assumption that two summers from now the team will be faced with the proposition of either resigning or letting go the top two picks of the very strong 1997 NHL draft.
But the Sharks are not without young talent. They can choose to let Dan Boyle, Joe Thornton and Patrick Marleau (38, 35 and 35 respectively before the next season) go. They will have enough support for the two players they must resign, Logan Couture and Joe Pavelski, neither of which will be 30.
Outside of those two obvious choices about young talent, there are several others that have a good chance of rising to that impact level. Five of them would truly be considered breakout stars—players who have not yet been everyday starters but could be ready to play roles in the top half of the depth chart in two years.