I think C'Mon will still keep growing at a slow pace for weeks and weeks to come even without promo.
It's just annoying because if they got some promo out of the way we could move on to a new single faster.
I still think this will be a big hit for her, even without heavy promo. But I do wish she would make more of an effort. Having a song slowly but surely take off by itself must be wonderful for an artist, but it's really boring for us fans who look forward to appearances and performances and stuff like that.
Seriously though, once the new songs from JB start to fall down the single will start to climb again. This is #29 overall on radio and it's still getting positive updates which is great. It's going to take time. It hasn't even been released for a month yet. So much room for this to grow.