Hi all,
Long time lurker, first time poster. FWIW, I think Tiger's problems can be traced back to the spring of 2001. I'd just had satellite TV installed at home, so that I could watch the PGA Tour. That first week, I distinctly recall watching him practicing at one of the early tour stops (Phoenix I think) working on a much flatter plane - the commentators stating he was working on the draw shape required for Augusta. Remember this is when he was going for the Tiger Slam.
Could he ever get his 'old' swing back, even if he wanted to? I doubt it -his body shape has changed a lot since then.
I'm no great fan of Woods, but I was a fan of his old swing (I actually preferred the slightly shorter backswing in the 1999 version). However watching him do those bizarre drills and then hitting those off the planet drives reminded me of Seve in decline. The more he 'worked' on his swing through the week, the worse he hit it.
There is a quote (don't remember who said it) that Nicklaus won his majors 'in spite' of his swing. The same can be argued of Woods in the last few years, who has relied on his short game, putting and course management.