Scotty and Chekov replaced Spock and McCoy in Generations. If Koenig had turned down the role, Uhura or Sulu could've replaced him without too much trouble. But I find Scotty more difficult. If you can't get Spock to do the technical stuff in Generations, Scotty is your next good fit and, in some ways, works better than Spock. But I find it hard to see Uhura, Sulu, or Chekov coming up with the technical plan in his place if Doohan has also turned down the movie.
What do you think would've been a good fix if they couldn't have gotten Doohan either? Give it to a random Enterprise B crewperson? Have Kirk do it? Something else? Have the writers shared a back-up plan themselves?
What do you think would've been a good fix if they couldn't have gotten Doohan either? Give it to a random Enterprise B crewperson? Have Kirk do it? Something else? Have the writers shared a back-up plan themselves?