I support.
Majora's Mask is in my top 3 Zelda games (alongside Breath of the Wild and Twilight Princess). It is an amazing game. The way everyone lives what they believe is their last three days is different: some seek shelter, some deny the moon is falling, and some stay with their loved ones. The Anju and Kafei quest the best quest in all of gaming in my opinion, and the end of it gets me everytime.
Let's not forget the stories of the Deku Butler's son, Darmani, and Miku. As well as the quests and side quests of restoring peace to the wandering souls of Ikana, Pamela's father, the final day postman, Kafei's mother, and many other side quests.
And the Skull Kid himself. An imp who felt betrayed by the only friends he ever had. This is what drove him to darkness and evil.
And lastly, the final words spoken by the Happy Mask Salesman at the end:
"Whenever there is a meeting, a parting is sure to follow. However, that parting need not last forever... Whether a parting be forever or merely for a short time... That is up to you."
The game has such beautiful storytelling. I hope Breath of the Wild 2 follows in its footsteps.
Anyway, it would be amazing for Skull Kid to be playable. Nintendo knows his popularity (Hyrule Warriors, A Link Between Worlds Majora's Mask cameo, and Cadence of Hyrule). Let's not let his parting be forever.