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Sun and Moon were set up for a sequel perfectly.
>Pokemon league was just formed, you can see the gym building sites all around Alola
>Hau wants to become the Mele Mele Kahuna
>Gladion became the Aether president
>Necrozma is just there in S/M but seems way more important than Zygarde
>Lillie said she'd return after Lusamine gets better
>chance to see all the characters grown up, Lillie being the new Pokemon Professor, Hau the Mele Mele Kahuna, Acerola becoming the Ula Ula Kahuna after Nanu retires, your old character as the champion, etc.
It all comes together.