I can't imagine why the concern in the OP is such a big issue? Surely every demographic doesn't deserve a 'romance option' (quite sickening way to see a character in a video game really) tailored to their real life sexuality, even if they may be the majority real-life demographic. The last game screwed everyone over catering to the somewhat strange idea that players can't tolerate having their preferred character not romancing their Hawke (and so making everyone bisexual, which is a laughably bad design choice and quite immersion-breaking actually). I can understand a fictional universe where everyone is bisexual, but given DA: Origins didn't have this feature, it just comes across as utterly bizzare.
Earlier in RPGs 'romances' used to be fun diversions, and that's all they really should be, albeit in a few cases, when correctly done, they can significantly contribute to the quality of the story. I am quite glad they are returning to believable or sensible preferences. I'm sure Bioware knows better than me how this sort of thing will affect sales, but it kind of ruins a character to force them all to be bisexual, so that everyone can romance them by clicking a heart button. It would be a bit more refreshing if romances actually required something other than just picking carefully designated buttons.