Let me just say that our appetite for The One is fierce. And the voraciousness of this appetite is visible in what we create, in the media we endorse, in the very consciousness imbibed from that constant flow of information around us. Blockbusters like Batman: The Dark Knight, avant-garde 'minimal acting' films like the Before trilogy, psychological thrillers such as Eternal Sunshine of the Spotless Mind, and TV series in the way of How I Met Your Mother and Friends, they all have one thing in common - they are universally committed to the idea that there is The One, or that, at the very least, there is a search for The One, a search that will make the day-to-day, mediocre relationships worth holding out for. I can't think of any self-enclosed widely-distributed production that subverts the standard romantic agenda - even in films wherein the leads don't end up together, there are still sad violin music and tragic-sounding voiceovers (I'm thinking Atonement), all perfectly calculated to evoke nostalgia/regret and for you to think, 'oh, if only they got together'.
In capitalizing on the religious, mythical tradition of The One, it becomes too easy to forget that what we're really selling out are alternative ideas of real human connection, i.e. human connections that can be at once permanent and partial, 'permanently partial', and authentic, fragmented, multitudinous, manifold, timely, time-impelled, sometimes without investment into the future and determinedly without so, human connections that may have nothing to do with serial monogamous relationships that conclude with a revelatory chance-meeting with The One.
Which is kind of sad, having such a universal glossing-over of attachments not so given to The One. I can only speak from experience, of course, but my experience has shown me plenty of fragmentary, ephemeral human connections that have never been the less potent because they weren't associated with a superlative one person or potential person.
There'll be no need to watch Ronin 47 to know of the romantic theme of someone going to the longest lengths for someone else. Maybe there'll even be a Wolverine ending where, after being pitted in life-and-death situations and developing some very intimate moments in an exotic location, the main characters return to The End, at which point their time is up, and so is the gig of partial-yet-permanent human connection. Let the audience not forget that the main character is still super committed to a Jean Grey-like figure, who is of course the only real love interest involved.