I think Spieth will be just fine. His putting will ebb and flow, just like it does with just about everyone else. He had a remarkable season last year on the greens, and although he's yet to recapture that same degree of confidence in his putting this season - it's not like he sucks rolling the ball, whatsoever. One thing he does need to probably consider, however, is that playing consecutive tournaments internationally will take a tremendous toll on his game. He realized that over the winter and admitted as much, so I wouldn't be shocked to see him nix a few tournaments from his schedule next year.
But the other factor that is probably more at play is that it's not like he's teeing it up with a bunch of nobodies. Bubba, Mickelson, Jason Day, Dustin Johnson, McIlroy, Adam Scott, Justin Rose... these are just a few of about a dozen or so guys who are playing some pretty good golf and have played pretty good golf (some of them) for a few years now. It's not like they don't have the talent to win multiple events each season. So to expect anyone to dominate the game for longer than a season-long stretch is unlikely, although Jason Day is certainly trying to prove that wrong at the moment.
Speaking of Day... he can win on just about any type of layout. He can win on long courses, short and tight courses, he can manage the wind, and he's undoubtedly been the best all-around player for the past couple of seasons, if you consider all aspects of his game. He's still riding the momentum from a great year last season, and I certainly would have to believe he's the player to beat next week in the Masters.
But... he still has to go out and execute, for four rounds, and that's not easy at a major. So as much as I'd like to see him continue his major run - he's facing some stiff competition and will have to play some excellent golf.
I think we're gonna enjoy one helluva show next week at Augusta.