No matter what she does or how wonderfully the BA turns out (or even if she'd never had the reduction to begin with, for that matter) she is bound in 2011 to be compared, probably unfavorably, to her younger 2001 self. That is the unfortunate reality of time passing and getting older, but is compounded by the fact that folks have tuned out over the last five years and perhaps not noticed her gradual aging in general.
On the other hand, what she may have lacked towards the end of 2005, leading up to the reduction, in terms of enthusiasm for her, um, craft... "my heart's just not in it anymore"... perhaps she'll tear into it the second time around. Eye of The Tiger, Rock! Eye of The Tiger! I'm just playing armchair psychiatrist here, but surely she must associate huge boobs with her own youth, fame, fortune, etc. Glory days , before the reduction. "Plastic Linsey" may be a whole different thing (for the fans) but what she may lack in natural gifts and youth, she could make up for with determination and zeal. And size!