Most of them have talents and things seem to go quite good. But the way I see things, the ones that most likely could be around for the longest are:
Kevin Zegers
Charlie Cox (because of DD)
Emily Browning
AnnaSophia Robb
Rory Culkin
Jamie Bell
Kristen Stewart
Robert Pattinson
Freddie Highmore
Thomas Sangster
Aaron Johnson
Dakota Fanning
With a honorable mention of Frank Dillane who's about to leap the world of films, after having studied acting at Royal Academy of Dramatic Art in London.
However, I decided to vote only for the bolded names as they are the most "safe".
You can like them or hate them, but they're already famous and they are being offered a lot of roles. Something that doesn't seem to end.
But I could be wrong. Which would be a good thing because I rather have a another one from the poll to replace Pattinson.