IMO, the best current portrayal of IR on TV is the one on "Happy Endings". They have excellent chemistry, race is not the focus, but they don't completely ignore it either (in other words, it's not like a white actor could play his role) and the wife (Eliza Coupe) is very attractive. And on top of that, it is a good show.
I must say that I have noticed it a little more on TV these days. If a show features single white women, there is a pretty strong chance that at some point one of them will date a black guy at some point. (two of the four women on Sex and the City dated black men at different points)
As much as the media recently complained about HBO's 'Girls' lack of diversity (I haven't seen it) I would expect that there will almost certainly be an episode or more with 'swirling' in it at some point. And I expect for there to be 'swirling' on Men at Work at some point by the black character - if not very often.
As I think about it, the question is which shows do NOT have an IR in it - even for a single episode? (Those that get canceled after one season don't count) Even dramas like House and Private Practice have had IR in it.
The next ceiling to break (again IMO) is the "quota problem". What I mean by that is that once you have one IR couple, you certainly can't have another. Since Happy Endings has one IR, the other two women in the show will almost certainly exclusively date white men throughout the show. (I hope they surprise me).
At this point, it would be nearly impossible for TWO couples to be in IR without race being the central issue.
The other issue is that black produced movies seem to avoid IR with BM/WW like the plague. There was only one white woman to appear in 'Think like a Man' - and she was a very minor character - yet they had a WM/BW couple (that was boring btw) in the movie. I doubt very seriously they would have ever even considered reversing that. And correct me if I am wrong, but has a Tyler Perry movie ever portrayed a BM/WM IR in it? I don't like TP movies, so I wouldn't know other than seeing clips. But I do know that he has portrayed WM/BW a couple of times.