Weirfan
I'm sure it's difficult for him to just walk away. But the odds of him being healthy enough to practice enough, to get back to a competitive level where he can play more than half a season without risking further deterioration of his back problem, is something that he's been forced to consider.
I don't think even a healthy Tiger Woods can win another major. And if he can't physically put in the work needed to return to that level without risking his quality of life going forward, then I really don't see how he could justify that level of risk, especially with such little reward to come of it.
Winning another tournament at Bay Hill won't impact his career, as unlikely as even that might be.
Might be time for him to pursue some other avenue in golf, maybe become more active in his course architectural ambitions, if he wants to resume a life in the game. His days of winning anything significant in tournament golf are over.... his contributions outside of golf, however, are still there waiting for him.
And too - quality time with his kids.
While he can still manage to walk upright anyway.