Whilst he might end up here, I doubt Hall would get a big money offer from an NRL side. There are a lot of good wingers here, and at his age I'm not so sure they would throw money at him, particularly given the really poor record of SL backs in the NRL in recent years. His attributes would work here - size and strength are important - but he's unlikely to be a game breaker.
FWIW I hope he stays at Leeds for the rest of his career.