Beckett's '06 was bad, and there's a reason for it. He wasn't throwing his change at all, and his curve had no consistency because he was warming up with tape on his finger to avoid the blister issue. So his reportoire was mostly the 4-seam FB, which he had difficulty locating because he had sped up his delivery. Bad management by the coaching staff there.
Fortunately, they brought in a new pitching coach who put it all together, reintroduced the change, gave him the feel for the curve back, improved what I think has been one of his more effective pitches this year, his 2-seam FB, and slowed his delivery down giving him command within the strikezone. His rate stat improvement is real for these reasons. Suggesting he could revert to '06, meaning he just ignores everything he did to become successful this year, is a big fat pile of wishful thinking on the part of Yankee fans. I'd agree with them wholeheartedly if his success this year was due to some flukey overperformance by those rate stats, but it just isn't. If anything, he should be better due to some poor luck this year should he maintain those rates.
All that said, if Hanley plays like this for the next 6-7 years through his prime, then I'd take him back without question. Beckett is very good, excellent in fact, but not historically good, and Hanley has a shot at being one of the historical greats.