This is never going to happen because it would be an idiotic decision, and this superbowl winning front office rarely makes idiotic decisions.
1) The money is not there past next year. You could sign another 10m per year player, but that means that 1 of the big 3 could not stay on: Wilson, Earl or Sherm.
2) He doesn't fit this team. He is another 5'10'' guy. He is a poor man's Percy. Percy without the speed/quickness (we are speaking in relative terms here), without the toughness, without the ability to run from behind the line of scrimmage. For those saying Jackkson is better, I don't think you watch much football.
3) Draft picks are like gold around here. When you have all the young talent, then you need to keep it by paying your players, then suppliment the roster with later round draft picks.
So basically he is too expensive, redundant, and would cause problems long term. Basically there is 0% chance that this happens.