What? A lifetime commitment? Are you suggesting he should be obligated to stick around until his body is broken and his brain turns to mush?
9 years, 103 sacks, 3x Defensive Player of the Year (most all time), 7x first team all pro and anchored the defense that won them a Super Bowl. He should have been awarded game MVP.
He goes into the Hall of Fame in 5 years, no questions asked and will be remembered as one of the most dominant forces the league has ever seen. He doesn't owe anybody *****.