hm no? Destiny's Child went from 3m (their first album) to 15m (their second album), Backstreet Boys sales increased from their first album till their 4th, NSYNC increased too. Not everyone peaks with their first album, sorry.
Who cares if she peaked with her first album when her peak was bigger than every other popgirl's peak?
Lady Gaga, Avril Lavigne, Beyoncé and Kesha also peaked with their first albums (album-sales wise).
I mean, Britney's legacy lives through Gaga, considering she has said many times how Britney influenced and inspired her, so Britney really wins either way.
