i think the best way to do the next trilogy is to take the path of the O.T style, by the rhythm, the humor the action the adventure and the most important the acting direction by that to choose a very good actors (not essentially stars) George lucas was smart (blessed?) to have cast the magic trio Hamill, Ford and Fisher...Spielberg is on the top, but i don't think he'll do it...still Kathy Kennedy is a very good friend of him..and old time producer of his movies...Who knows.
One of the pixar directors, they are so talented and SW ultimate fans, maybe Brad Bird, Lee Unkrich, or others well known young directors..kevin smith, ben affleck, edgar wright, Duncan jones, Josh tran.
A story after the ROTJ with an older Luke (The one and only Mark hamill) will be a blast.
None of those : J.J. Abrams, Joss Whedon. Christopher Nolan, Peter Jackson, Matthew Vaughn, can really do a SW sequel, they are too big and at the end they gonna deliver a movie that has only the title STAR WARS in common with the Previous Episodes.