Tiger will never be as dominant as he was because of rule changes. Hitting v groove clubs out of rough with spin and accuracy is a lost art - a skill no longer needed after 1977. That is why you are seeing players who hit a high percentage of fairways off the tee succede.
Woods was nnever an accurate driver. Boxed grooves, however, let him rip many shots out of poor lies with enough accuracy to bring his phenomenal putting game into play. That type of game is gone. Good riddance as far as I am concerned. Boxed grooves changed the game to favor brutes rather than skill.
Changes to groove rules and equipment changes are hardly the issue, and every golfer has to play with those changes, not just Tiger. I've also read about tests against these groove changes, and though measurably, it seems to have little overall impact on professional golfers.
The scandal and subsequent divorce has mentally affected Tiger Woods, and his recent injuries, whatever their cause, have compounded his downfall. As one who has demonstrated remarkable mental strength in the past, clearly his mental and physical abilities are out of synch. The game of golf is littered with numerous examples, but none have been as dramatic as Tiger Woods.