Episode IX: The Force Ends
In episode IX, Kylo and Rey will battle resulting in fatal injuries to both. Leia will come and drain all of their force power and in the process heal their wounds, but render them unable to use the Force ever again. Leia will then become the most powerful Force being ever. She will then decide to end the conflict between light and dark by becoming one with the Force. She then uses all of her Force energy and disappears and with it the Force diminishes to all users/lifeforms creating true balance in the galaxy, peace, and linking the entire Star Wars Saga.
Rey and Kylo realize they are in love and ride off in the sunset.