Oh I definitely believe the originals can, and should, be given very well structured arcs. I mean I love the Palpatine and Yoda arcs in the films we do have. But I just don't imagine this film will be focusing on them to the degree that they will be given strong character flaws that will play out in any real, in depth way. Perhaps if this were a Todd Fields or Mike Nichols film, sure, but as it stands this is an Abrams project off a Lucas treatment. Nothing in their histories suggests we'll be given any kind of great, flawed character arc for the older cast. As much as I would love to see that. I just expect more Gandalf in LOTR/Hobbit than say Michael Corleone in the Godfather trilogy, or Rocky in Rocky Balboa.