I'm sure after the Hunger Games' BO numbers, they rushed to beef up Lawrence's role in a major way for any X-Men sequels, by themselves. I don't think Halle Berry really ever had all that much star power, despite her prominence. It seems like no one is a bigger mark for her than Halle Berry.
IMO Jennifer Lawrence was going to be one of the first female star to carry a blockbuster just by her own star power since Julia Roberts.
Winner the Oscar can only weaken her chance to be a real action star. Although she probably doesn't care about being a superstar anyway. I am fine either way. I rather see more SLP type roles than Hunger Game type roles.