Youth movement for Sharks in 2014-15?

We like to think ahead here at Rumor Central, and one of the stories that has peaked our interest for next offseason is the free agency of current San Jose Sharks vets Joe Thornton, Patrick Marleau and Dan Boyle. The trio have been important contributors for the organization in recent campaigns, but it's not immediately clear that the team will re-sign all (or any) of them for 2014-15 and beyond; in fact, they may wind up as trade bait if things aren't going swimmingly for San Jose ahead of the trade deadline this season. So do the Sharks have enough talent in their pipeline to maintain competitiveness in future seasons without this trio?