This Sunday is March 4.
So March 11 is next Sunday.
Though it wouldn't surprise me if We Are Young do get #1 this week (ending March 4) but its airplay is about 95-100 million behind right now. Next week, it has a good chance if airplay increases and sales remain steady.
We are Young is predicted to sell around 270,000-300,000 while Stronger is predicted to sell 200,000-240,000 in sales. Stronger's airplay update estimates might be around 128 AI where as We Are Young might be somewhere around 29 AI when the airplay tracking ends. With streaming, Stronger might get its fourth week on the throne. I'd love to see We Are Young to top the Hot 100 at some point, though. But I hope Stronger to stay at the top for the next coming weeks.
I want it to be Stronger but I'm pretty sure WAY will get #1. I don't think those Billboard estimates are right. Based on kworb's site, Kelly started the week selling about 70% of Fun on Monday but then quickly dropped down to 60% where she's been for most of the week. (Including both songs' multiple versions charting). So do the math. even if Kelly managed 65% of Fun's sales, they would have to sell less than 280k for her to remain at #1. Kworb has the estimates at 322k for Fun and 202 for Kelly which gives Fun #1 on lock. I think it will be more like 305 for Fun and 195k for Kelly.. with Fun stealing #1.