Even if the TV series is over, this will not be the last time we will see Kamen Rider Ghost. He will return in the upcoming Kamen Rider Ex-Aid & Ghost: Movie Wars 2017 film, and as Akari's actress Hikaru Osawa revealed in an interview, a Kamen Rider Ghost V-Cinema spin-off is in the works.
[Source: Yume no Sekai e, HeroShock]