Keep in mind that the Hall of Fame is not just about raw numbers, cornerstone players from a multiple championship team are given extra consideration. Players with a lot of personality and "fame" seem to be at an advantage too.
Wilson, Sherman and Earl are on a first ballot trajectory. I think Kam probably is too after establishing his reputation so much during the 2013 postseason.
I think if Lynch has 3 more years like the last 3, he gets in easily, especially if Seattle has multiple rings over that period. He is one of the most famous runners in recent NFL history, and a famous personality / identity as well. And production wise, he just needs two more 1400 yard seasons to reach the 10k club, which is about the range where you start seeing RBs considered for the HoF.
The hard part is getting those seasons out of Lynch, I would be surprised if he has that much of a future ahead of him, though he hasn't slowed down yet.
I think Harvin will have to get into the HoF for his kick returning exploits. Our offense will make it hard for him to rack up pro-bowl bids.
Unger had a tough season last year but he's become a reputation player at a position that is pure reputation with very few standout players. Unger already has 2 pro-bowls, if he finishes with 5 or 6 and a bunch of rings, not hard to see him getting in, even if he maybe doesn't deserve such a distinction.
Lots of "maybe" players on this team. But Seattle only had 5 pro-bowlers last year despite having hands down the NFL's best roster, which shows just how much Pete spreads the ball around with this team. But I think Pete cares infinitely more about Championships than awards, and the HoF is an award, albeit the ultimate one.
Speaking of which, I think if Pete gets three rings he's definitely in no matter what. Ditto JS.