Garry is falling and Jason will follow him. If Dierks or Carrie don't pass Tay, BA will be #5 easily.
Carrie is actually starting to slow down alot so I don't see her being a challenge for a couple weeks and Dierks lost his bullet and might be done so I don't think we have to worry about either of them right now
I doubt it will. I think BA will get another 3-4 weeks to increase but the gains have been too small to be a #1 contender. She will need to gain another 1300-1700 spins to be a #1 radio song.