I don't have strong feelings regarding recast/digital either way, however, if it was me, I would leave the next episode alone since shooting is completed and simply rewrite the third film to minimize Lea. At that point, I'd try to use creative direction and CG Carrie Fisher only where necessary.
Regarding CG, I definitely don't see it as an issue in this case for one major reason. We don't have to guess at Carrie's wishes, nor take her family's word regarding her beliefs. Carrie herself planned to film the three new movies. As long as the family is still paid, I have a hard time believing that Carrie would suddenly be opposed to having her likeness in the third film.
Incidentally, I don't think re-casting is necessarily disrespectful either (and probably much less so that CGing, say John Wayne or Alec Guinness years after their passing). Perhaps this is because I think of films like plays. We aren't disrespecting the original cast when we see a new adaptation of a play, nor when an actor gets sick and we watch the understudy. Even in films, actors go to casting calls knowing that they won't "own" the role or have some exclusive right to be the only one to ever play the character. It's certainly more difficult immediately after an actor's death such as in this case, but hardly an insult to a prior cast member.
