As of right now, FourFiveSeconds is in a good place as far as in the BB100, radio, and in WW itunes chart.
The only thing is it seems to be stalling a bit; only #1 on iTunes New Zealand, really stable on iTunes (USA) between 0.70 and 0.85 at the #4 position, just a bit behind Thinking Out Loud. As for radio, this week's updates were really low imo and the songs with higher positions (Thinking Out Loud, Sugar, Time of Our Lives, Style) are all getting big updates compared to FFS.
What do you think about FFS's future performance? Will it start to decrease after its stable phase that its in right now? Will it go up after something miraculous happens (a performance

).
What I could see happening would be;
iTunes (USA) : maybe Thinking Out Loud will decrease a bit, making FFS #3, maybe LMLYD will decrease a bit too and UF is slowly declining, assuming FFS stays stable, it would maybe go up in positions with other songs decreases
Radio : Something has to happen for FFS to get bigger daily updates.. Because it will be blocked by Style, Sugar, Thinking Out Loud...