David McIntee has said he does have an out for Scotty's death, so his return has already been mentioned as a possibility if a story needed him after it happened.
And as for later day adventures of the TOS crew, we've gotten quite a few.
The Sundered takes place on the Excelsior 5 years after Kirk's death, and along with Captain Sulu, also has Checkov, Rand, and Chapel as crew members.
Vulcan's Forge takes place 1 year after Kirk's death, and features Spock in command of the USS Intrepid II, with Uhura as his first officer, and McCoy as his CMO.
The Art of the Impossible, and
Catalyst of Sorrows, both feature Uhura as head of Starfleet Intelligence.
She also appears in the same role in
Vulcan's Heart, along with now Ambassador Spock, Captain Saavik, and Dr. McCoy. Spock, McCoy, and Scotty appear in the TNG novel
Crossover, which takes place between "All Good Things..." and
Generations. McCoy, and Spock appear in the Double Helix novel
Red Sector. Spock, Saavik, Uhura, and Checkov, appear in all three of the
Vulcan's Soul novels, which are set after the Dominion War, and I believe are the latest appearances of TOS characters, other than Spock's appearance in RBoE. I'm sure there are probably others, but those are all the ones I know of.