Some of the later original cast Trek films are a good model for Abrams to look to. Especially The Undiscovered Country, as the characters were older, getting ready to retire, and readily acknowledged this was the last hurrah.
If Luke and the gang have one last grand adventure, and then pass the torch, whether all at once, or over the next three films, I'll be happy.
Can't wait until we see the cast in costume again. The first photo leak is inevitable.