I'm not sure what BB's methodology is, but so far, she's behind Taylor, Adele, Gaga, Katy and Rihanna in both album and single sales (probably not behind Katy in album sales though)
The thread is about female artist of the decade, not female singles artist of the decade. Justin didn't have any number 1s and yet he was the male artist of 2014.
Nah. Taylor Swift will probably win this decade. 5 years left now and Bey is not releasing anytime soon and if she does I doubt she'll try to get a hit or sell over platinum in the states. She's going for the bare minimum nowadays.