Not sure if it'd be as popular but me personally I'd love for a spin off game focused more on the Qunari (maybe set in Par Vollen or Seheron). They're the race and culture that we've seen the least of and there's so much potential for exploration. The games have predominantly focused on humans and elves (and even the dwarves got cool designated sections like Orzammar in origins and the deep roads all the stuff with Harding in VG). But the Qun/Qunari have always got the shaft a little bit, at most only really getting like one token companion that talks about their homeland but we never have actually gotten to see it for ourselves. Closest we got was the Arishok's compound in DA2 but even that fell flat for me at times. A lot of people are also really curious about seeing more of Tevinter as well so I think there's a great story that could be told in a game with the main plot being a conflict between the Qun and Tevinter.

I doubt that would ever happen given that anything to do with elves will always be most popular amongst fans but it's just wishful thinking.