If a 50ish hour game can't establish a romance, what about movies with romantic plots? I hate those in general, but an interesting point to think about. For me, only Visas Marr's "romance" makes sense and that's because it's not romance in the Biowarean sense. It was also pretty one-sided on her part, if even her love for you is a romantic love.
Pixar established, developed, and completed a life time's romance in under 10 minutes at the beginning of
Up. In
Wall-E, they created a believable romance between two robots without any dialogue. Film makers at the top of their craft have no issues generating and presenting compelling romantic plots. It's not even considered a problem in film. The only time such plots generally fail is when they're forced into narratives by marketing committees, as is often the case in summer action movies.
In games, on the other hand, I could count the successful executions of romantic narratives on one hand, regardless of whether they are directed at the player, or merely observed by the player. The Witcher 3 romances, both between Geralt and his lovers, and between Olgierd and his wife, can probably be considered successes, in that most people enjoyed or tolerated them. There are also examples from Planescape: Torment. But none of these are nearly as powerful as cinematic examples. In fact, I've never found a video game romance that was.
Yet, I don't think you can blame the medium. Video games are in a position where they
can support cinematic style narratives, and
at the same time also support Japanese or Bioware style dating simulators, and anything in between. The medium, to this end, has barely been utilized, especially by Western game developers. The Japanese have done more with it, and been highly successful at it, but due to cultural differences it wouldn't be fair to bring those up, as I don't think most of their designs would work for Western CRPG fans, or else they'd be much more successful in the West. Bottom line, then, is that Western developers have yet to come up with anything equivalent in our own culture, and so it remains a question as to whether it can be done.