I just wrote something about The Players Championship as golf's fifth major. My opinion:
ain't no way in heck.
I have two question for you:
1) Is The Players Championship golf's fifth major?
2) If you were czar of all things golf, and you
had to choose a tournament as the fifth major, which tournament would it be?
My answers, clearly, are "no" and if I were forced to, I still don't think I'd choose The Players. I think I might instead choose the WGC-Amex (which, I believe, comes to Doral next year and which Tiger won at Harding Park last year over John Daly). It's a stroke-play, great-field event that invites players who aren't necessarily strictly PGA Tour members.
But that's only if I was absolutely forced to pick. Four is the magic number, and until something drastic changes, that four is The Masters, the US Open, THE Open, and the PGA.