I refuse to believe that she has reached her peak musically. While TFM was really good, there is so much room for improvement it's not even funny. If she somehow fails to succeed it, then she sucks.
Irreplaceable is forgotten but On The Floor isnt?!?!
and Single Ladies wasn't released WW, it's chart position doesn't mean that it's impact wasn't felt globally because it obviously was. it sold 8-9 million WW, which is just as much, if not more than OTF.