Now now folks, there's no room for your logic in here. It's far more accurate to say that DA: I was filled to the brim with gay 'education' talks. Literally shoving the agenda down your throat at every turn. That makes much better hyperbole than the fact that it's actually less than 1% of the content of the game (about 10-15 minutes in a 100+ hour game).
On topic, I like the idea of getting a traditional Tevinter Magister. Someone who buys in the superiority of Magisters and is power hungry both with her magic, but also politically. She could be part of the party because of a 'our goals align..... for now' type of story arc where she's only supporting you (at first) because she sees how she can gain personally from your success. The only downside to this is that she'd need to be bisexual (that's not the downside; I promise
) and her female lover would have to be side-lined (a la Alistair) or she'd end up being a retread of Dorian. Not sure how people would feel about that. But it could be interesting.
To me, this would read too much like a romanceable Vivenne in Tevinter robes. I'm not saying that would be a bad thing!
When it comes to romances, I like variety. I like the storybook romances like Alistair's and Cullen's (even if Alistair's has an unpleasant little twist if you're not a HN). I like the tragic trainwreck Anders delivers. I like Isabela's "friends with benefits" that develops into something much deeper. I like Blackwall's... whatever that was. I would play and I'd probably enjoy a romance where the LI is blatantly using you, at least initially. It would take some stellar writing to elevate it from the wicked bi/lesbian stereotype, but the writers at BioWare are certainly up to the challenge.
But there is that uncomfortable stereotype surrounding ambition and lesbians, as if being a lesbian made them "badder," more evil. It's similar to the one where sexy women, in general, are evil. It's been done poorly in games before (c.f. DAO's self-fondling desire demon), and it tends to come across as a fetish. I think the writers are aware of that. They've gone out of their way to subvert the "sexy women are evil" trope, and I'm grateful, but I'm not sure the gaming public is ready for a complex, intelligent portrayal of a sexy, ambitious, bi/lesbian LI. I'm not adverse to the idea! It could be a lot of fun. But it is tricky.