Cinematoday had interviewed Masahiro Inoue (Tsukasa Kadoya / Kamen Rider Decade) for RIDER TIME - Kamen Rider Zi-O Vs Decade: 7 Zi-Os & Kamen Rider Decade Vs Zi-O: Decade Hall Deathmatch. He had revealed that every time he reappeared either in Kamen Rider Wizard or in Kamen Rider Zi-O, he used to play the role as if it's the last.
He had specifically mentioned that it's Shinichiro Shirakura who decides when the Journey of Kamen Rider Decade will end. But he had also added that every time he say "This is the end" and ends up getting continuation just like RIDER TIME.
Masahiro Inoue had also put in his thoughts mentioning that RIDER TIME could be the actual ending of Decade's story considering what is going to happen to him in the RIDER TIME's ending. This is going to be a satisfactory ending.