My heart says, that he really deserves to be playable in SSBU. He is iconic enough to be among the big-name-stars in gaming history such as Mario, Sonic, Link, Cloud, Ryu, Banjo-Kazooie, and Simon Belmont. But my gut tells me, that he sadly won't make it. Sora is in a weird licence position similar to Geno. It could be very hard for Sakurai to get the licence for him.