I enjoyed Ender's Game, and while the film met predictions at the box office on opening weekend, the true expectation of any potential franchise is to absolutely dominate.  Lionsgate, the studio behind Ender's Game, didn't get that dominant box office performance, and now they're mulling over whether or not they should pursue a sequel.  According to Variety, Lionsgate CEO Jon Feltheimer told analysts that the studio will "wait another week or two" before it decides whether to make another film based on the Orson Scott Card series of 13 novels (novels that are much weirder than the original book).  This isn't an encouraging sign since Lionsgate is making its decision made based on perception rather than reality.  The film's true financial success will be measure in ancillary revenues like home entertainment sales and TV rights.

However, even if Lionsgate decides to pass on a sequel, they might not give up on the property entirely.  Feltheimer says they're also considering a TV spinoff.  I assume in order to save money, the characters will always decide they're not up for a game in the battle room.