There's no way that Sora and Riku will be a couple. If he makes it Sora and Riku as a couple then he is like Kishi. Pandering to the "more popular" fanbase.
Nomura actually shot down that possibility years ago back when KH2 came out in Japan and a fan reportedly told him how much people liked SxR and he stated that he didn't care about that(which I still think was a bit harsh, but at least it shows that he's not swayed by fan pressure). Sora and Riku have always had a brotherly relationship and rivalry(with them even admitting that they are jealous of each other's personality/talents). The only person that either character has expressed a romantic interest in is Kairi, though Riku seems to have dropped out of that love triangle after seeing who Kairi's interest lies in.
Edited by Kagomaru, 15 June 2018 - 04:39 AM.