I don't agree with you.
For example, Gale and Astarion are popular as romance characters, Wyll is not so popular. So, make Astarion or Gale gay, and you'll see the crowd come out with torches, figuratively speaking. The same thing will happen if you close Gale or Astarion for LGBT, the hype will be incredible. In a bad way ofc. I've already seen this on Mass Effect forum. Believe me. Anyway I believe that all characters can be traced to their true tastes. But give possibility of romance to everyone, and at least no one will complain.
Are they popular with male or female players? With male or female main characters? How popular is popular? Do 70% of the players romance them? More? Less? Do you have those numbers?
In regards to the crowd and torches, I agree. But that says nothing about what the majority of players want. It just acknowledges a vocal, aggressive group.