Possibly, but even with one Astarian and one Shadowheart, if there happens to be a non-companion/non-romancable Minthara in the game, the outcry will be loud and fierce to include her as NPC in the party and possibly in the romance crowd.
Though that seems unlikely given Divinity not really having any sort of "Drow".
I suppose if Malady shows up again, she might be desired (She's very much a hot mommy character)
Trying to force "diversity" on your clients or public by presenting a premade take-it-or-leave it set of choices for them has proven to be a very difficult task. Many will just "leave it". And that's only normal after all.
I mean, that's kind of fine though?
Like, they're not making a Dating Simulator. So it shouldn't really be expected that everyone will have a romantic partner they wish to pursue. Nor should it be a major priority for them to pander to everyone with their characters.
Heck, if we take Mass Effect, I had no desire to romance any characters in game 1 or 2, none of them appealed to me (I only did so in a single playthrough of Legendary Edition simply to get the achievment for romancing in all 3 games). It didn't really hinder my gameplay at all to simply stay friends with the cast (Which was fine. ME2 characters were well written enough that I enjoyed them. I just didn't care for any in a way to push for a romantic relationship)
The goal should be simply to make good characters. Ideally with diversity because that allows players to explore the world more, with unique perspectives based on companions races (For example, how Lae'zel provides more of an insight into the savage ideology of the Githyanki). Not simply make the most romancable characters.
I think while sex does bring appeal to a game, it shouldn't come at the cost of the core aspects of the game and developers shouldn't have to abandon their vision to pursue sex.
Larian did a great job in Original Sin 2 by having diverse companions (Which appears to be what they want, given the quote mentioned in the OP of this thread), without the need to sexify them. I don't think it's necessary to abandon that simply to bring in people only really interested in the sex and who don't care as much about the actual characters or exploring the unique perspectives of a diverse cast.