They may not have to worry about losing the rights, but given how much money the Batman series has made - in particular the last two movies, but even the 1989-1997 movies - I'd say they'll be anxious to get a new Batman movie into the cinemas as quickly as they can, without messing up the franchise.
With Superman Returns underperforming, Green Lantern flopping, Wonder Woman stuck in development hell, Batman has been the only surefire hit in WB/ DC's stable, though Man of Steel's performance will hopefully change that.