If Taylor Swift (the girl who always tops iTunes) couldn't dethrone WAY, Boyfriend sure won't do it for very long, if at all.
And Bieber would need to sell closer to 500K to make it a possibility. WAY will probably sell 325K+ next week alone, and with all the radio play its getting, Bieber won't stan a chance.
Extremely unlikely. WAY likely puts up another 350k sales alone next week, added to approximately 120m AI on BDS and huge streaming and On Demand points.