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.