Chancellor is only scratching the surface of how good he will be . . . he's becoming a complete football player, as well as the most feared safety in the NFL. QBs always have him in their mind to prevent their receivers from getting killed. Thomas and Chancellor are the perfect duo because they complement each well.
Sherman and Wilson are well on their way.
Lynch has the ability, but as you say, he has a lot of catching up to do. He's currently #52 on the all-time rushing list, and he's the youngest player in the Top 75. I have a feeling he's going to slow down this year because his rushing style is so brutal on his body. Then again, I need to stop underestimating Lynch. He's a superhuman beast. If he averages 1,200 yards for the next four seasons (until age 32), he will be in the same class as Jim Brown, Marshall Faulk, and Marcus Allen. That's a seemingly impossible task, but again, I'm done underestimating the Beast.
Pete Caroll is also an obvious choice, but it will help if he wins another few Super Bowls before he retires.
Percy Harvin is only 25. He's where Lynch was three years ago. His career is just getting started.
