There's more to it than "if only he worked harder." Martin works very hard, I wouldn't deny that. My point focuses entirely on whether he's working to get the book out within the next two years, or whether this will fall into 2016. He's going to basically be on the road for most of this year; his biggest periods of "non traveling" seem to be right now, and in June-mid July. Next year his schedule is empty until May 2014. Now, if he starts adding various new cons and speaking events into early 2014 then I don't think it's outrageous to suggest that bodes poorly for the book's release window.
GRRM isn't my bitch, nor am I entitled to the book ASAP. I just don't believe another 5 year wait is possible, with the show catching up to him. Granted that assumes the show will continue; perhaps it'll be cancelled. But I think we can all agree that unless the Red Wedding leads to a massive drop in ratings (unlikely IMO) the show will be renewed for a fifth season by this time next year. Likewise given how strong the second half of ASOS is (plus whatever ADWD/AFFC stuff they add), I think a sixth season is probably a go too; after that who knows. Martin has compared this process to laying down railroad tracks as a train quickly rushes towards him, and it's clear to see why. To me, a 2014 or 2015 release would give me confidence, and the only way that happens is if Martin buckles down. That's all I'm saying.