Yes, maybe for this season, but i'm sure that Hokage Minato will show up once again after some months .. Since giving way to other upcoming new ninjas have more priority than releasing old ninjas in events repeatedly .. How can i put this into simple explanation? .. hmmm .. Let's say in Anime, The plot story is the Whole Game where New Characters constantly showing every season, but to make a break for this story, they put some episode which is about the side stories of previous episode, and that is what we call the "Fillers" which we can compare to the Old Ninjas ..