In all honestly, I am tired of superheroes dating non-superheroes in general. Comics handle relationships poorly as a whole, regardless of gender. I am tired of the Lois Lane/Mary Jane damsels-in-distress. It's a cheap gimmick that's lost it's luster long ago. That sort of thing is what innocent bystanders are for.
Not having the principles actually get with anyone is another dynamic shows and comics use to keep the fans interested. For example, any females that enter the "Supernatural" series are either friend-zoned or killed.
As the studio sees it: ladies like fantasizing about finally being the one to "heal" the brothers, whereas the guys want to fantasize living the unattached lifestyle. I can see the reasoning, but I think good writing trumps it, so I disagree with it. The TV show Castle deals with this in a palatable and interesting way.
I've never particularly ascribed to the "commitment = stagnation" ideology. I just think that heroes deserve appropriate matches. For instance, I supported turning Spiderman into a bachelor again, simply because they handled MJ so poorly. I'll admit I've always been a Black Cat fan (never a distressed damsel). But even if MJ is his fated one, at least handle her properly, for pete's sake (pun intended).
I think a valid excuse, however, is turning away fans who have one favorite or another. For example, there are Wonder Woman/Batman fans, and those who think she can only be with Superman. There are those who think Lois is great, others who hate her. For the record, I have hated every incarnation of Lois Lane until Smallville and Amy Adams (although she was palatable in the Death and Return arc in the comics). But that doesn't mean I'll stop reading Supes just b/c he's with Lois, or start reading b/c Wonder Woman is with him, only if the stories get dull.
Rogue...there's another pisser. Her and Gambit are clearly attracted to each other, and she ends up with Magneto-clone due to some ham-fisted loophole?! Bull...controllable "Genosha collars" work just as well as magnetic body condoms. They turned her into an powerless, indecisive caricature. Gambit became an arse for even looking at another woman, but hey, who can blame him right (sarcasm)? Contrived reasons to extend needless drama frustrate me.
If the love interests aren't contributing to the story, at least have them be the normalizing factor that keeps the hero sane. But for the love of God, don't make every other arc about their kidnapping/death, and don't trivialize them.