Technically there already is a dragon-spaceship-like mount in the game that is multi seat, but it's not FFVIII's Ragnarok. Given the name Ragnarok is already in use in the game - previously as a class of ancient Allagan spacecraft, and now more recently as
as the name of the Sharlayan-built spaceship used in EW to access the final zone
, unless SE did some creative renaming (like how the mount version of Cloud's Fenrir motorcycle from FFVII Advent Children being renamed the 'SDS Fenrir' to differentiate it from the actual Fenrir which is also a mount), I don't see SE adding this.
But, stranger things have happened!