I get that the new Star Wars should be rebooted, but not at the expense of just wiping out the original cast. You have to remember that the kids (myself) that grew up with Star Wars always had Luke, Leia and Han in Episodes 7,8 and 9 as the rumor went around school when talk of future films would be about.  For us, this was just a given that they would be included. And now that we are finally getting those Episodes, it's not as easy to kick them to the curb just because they are 'Old'. I just think that Disney will want to have their hands in both pockets (Old and New fans) and the only way to do this is to have Old and New cast in the same film. Besides, Harrison Ford wanted his character killed off at the end of Return Of The Jedi. He was vetoed by Lucas. If Harrison does in fact come back for another Star Wars film, I can almost guarantee you that he will meet his demise at the end of Episode VII and I think this too would end all of the Old Cast for just a one time only film before moving onward with the next gen cast.