I think Maneater has a good chance of getting to one. Promiscious was a big hit for the US and Maneater has the same type of feel. In my opinion, it should get to one. It's being played a lot on the radio over here and I can see it coming big.
I don't want to be biased or anything since I'm a big fan of Nelly...but I think she released it at a pretty good time. Promiscuous has been around for almost half a year, and I think it's time to see how her 2nd song makes it.
However, i don't think it will end up being as big as Promiscuous, but Maneater is a good song.