It would have been really bad if there was never a sequel to G.I. Joe: The Rise of Cobra, since the film obviously sets one up. However, it is being reported that work on a sequel has already begun and that the lead actors are contractually obliged to return (though director Stephen Sommers is not confirmed).
Work has also begun on a new Wolverine film and Hugh Jackman confirms that the film will cover Wolverine’s time in Japan.
If these films follow the path for sequels, hopefully they will both show up within 2-3 years.