Add other force ghosts to the Luke/Leia shot like Anakin and Obi Wan.
With the exception of Ben, I don’t really get this suggestion. Anakin, Yoda and Obi-Wan have no meaning or significance to Rey. They did to Luke, but we already got that scene at the end of Return of the Jedi.
What I think a lot of fans don’t want to accept (and to be honest, I don’t think Abrams and Terrio wanted to accept this either) is that the OT characters are not the main characters of these new movies. The protagonists are the new characters: Rey, Ben, Finn, Poe, and Rose. Any OT or PT characters should be there to support their character development, not to steal the spotlight.
But it’s the very last installment in this franchise, and the last time we got to actually see Anakin and/or Obi-Wan was in Return of the Jedi. Are you sure we should not get to see Anakin, Obi-Wan or Yoda in the very last scene of this entire franchise?