I don't think NF did as well as Vanessa and Irv would have hoped, but it's not the end of the road, so stop panicking people. I mean, look at artists like Fergie, her first single "London Bridges" was a mild success, didn't get much radio play. But her follow up singles especially "Glamorous" and "Big Girl's Don't Cry" have been huuuge hits.
So Irv and Vanessa have plenty of time to churn out a hit and kick in some promotion for the record and the next single they plan to release. It'll take time for this record to blow up, you just have to wait for it to catch on.
It's not going to be instant over night success by any means. But Irv is a smart guy, so I'm sure he has a couple of things up his sleeve.