Bringing it back, I don't think that even if value as a potential romance is a consideration for Larian, that's a reason not to hope for a shorter race companion. In fact, I'd hope it would be more of a reason, given that our shorter-race Tavs currently don't have any potential love interests their own size, if that's what they prefer. I'd be perfectly okay with a conventionally attractive gnome, halfling or dwarf companion .
Funny you mentioned that. I don't think there has ever been a female dwarf, halfling or gnome with a romance anywhere in the history of all RPG games. All romances options are always humans, elves, and half-elves.
Scout Harding in DA:Inquisition. [And no, I haven't. I don't do romances and the 5 or 6 years of totally debauched Skyrim were definitely not romantic.]