Showing Lana’s moral fall would be much more satisfying to me than some vague sense of fate and coincidence getting in the way. If two people really love each other and were meant to be — fate and coincidence are things that can be overcoome — barring things like um, death. I would rather their final breakup to be about their moral and ethical differences so, I say, bring more Lana in black please.

Yeah, I agree with this. I think the show could have gone the route of Lana simply being unsuited to being partnered with someone who regularly risks themselves for the sake of others. I've talked about it elsewhere, but it's basically the idea that there are some people who should never marry a cop or a firefighter, because they're not suited to handling the stress of always worrying about their loved ones' well-being and they get resentful of the fact that complete strangers are often a priority because of their loved ones line of work. The series could have drawn the eventual Clana dissolution in those terms, but they've clearly decided to show that Lana is supportive of Clark's heroic tendencies, that she doesn't seem to mind them.

So. Something has to come between them, since we know they don't end up together. I'm not crazy about the idea of Clark and Lana Don't Work Out because Lana, like, fell down a well and died or something. I think it works better if it turns out that they're not suited to one another. Because then, they get a real chance to make it work and they both learn that it won't. And they can then both move on. I absolutely think Clark needs to get the "what if ..." of life with Lana out of his system and I think Lana needs someone who can always put her first and who sees her as she really is, flaws and all.