No, but they did anyways. ATLA can't be turned into a good stand alone film, no matter how you slice the material. Either you cut all character development and story motivation to retain an arc, or you fail to have an arc at all. From a technical perspective you can also say that the series loses a lot in the transition from animation to live film, along with other things like the loss of Jeremy Zuckerman and Ben Wynn's original score.