Can Sam Worthington and Zoe Saldana be breakout stars?

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I think every succesful james Cameron movies has breakout stars. Terminator has Linda hamilton and Arnold Schwarzengger (who become one of the best action stars ever), Aliens has Sigourney Weaver (although she starred in Ridley Scott's first movie, it's not until second movie she got Oscar nominee for her role) and of course who can forget Kate Winslet and Leonardo DiCaprio? Yes, though they both got Best Supporting noms from the Oscar before Titanic (Kate in Sense and Sensibility and Leo in Gilbert Grape),it's not until Titanic they become huge A list stars. Kate Winslet who was underestimated at the time because many think she does not deserve Best Actress nominee while Leo didn't get the nod, turns out to be one of the best actress in our generation with 6 nominee and 1 Oscar...and she is still 31 years old! And Leonardo, as a teenage heartthrob who can fall so easily choosing his next movies very wisely, becoming the new Scorsese fave actors and receive several Oscar nods himself. The thing about Zoe and Sam is they both lack movie appearance in Avatar (those blue Navi thingy!), so it's hard for the audience to connect with the stars. However, Sam worthington seems to pop up from nowhere to be breakout star of last year. Almost unknown in the US, he's being a scene stealer in Terminator Salvation and got main role in Avatar and this year's Clash of The titans. I still feel he is still under the radar, no tablod thingy, which was good for his career. As for Zoe, anyone know what is her next project? Sorry for this lengthy post, just want to share my mind to you all. So, do you think both stars can be BIG?