Your post is all over the place.
How are you going to include a mention of Spock and Uhura in the current Trek TV films or even bring up who Will Smith hooks up with in films when the title of your thread claims the topic is supposed to be about TV?

. But his character does seem to be interested in the woman played by Minka Kelly who is white. Perhaps you are referring to another show.
As for Scandal....did you just start watching? Yes, Kerry's character is hooked up primarily with white guys, especially the married white POTUS. This has been the case for awhile. The good news however is that it is far from being the most popular show on TV.
That being said what we see a trend of on TV are shows with black female leads (or co-leads) in which their love interests are white males. This included Hawthorne and that Megan Goode show and the one with Thandie Newton on Starz and of course Scandal. It may possibly even include, eventually, Sleepy Hollow since a lot of fans are shipping the white guy lead and the black female lead. With the exception of the Megan Goode shows all the other series were successful enough to be renewed for multiple seasons (Sleepy Hollow got a second season order after the airing of its second or third epiosde). That means network execs have examples of hour long shows with black female leads that click with mainstream audiences. Thus that may mean the networks will create more of these (one with Halle Berry backed by Spielberg is already on the way). Those same execs will also notice that those black women have been paired with white men and not only did it not harm ratings it also apparently didn't generate racist backlash from viewers. Thus that may mean the networks may continue to keep going down that road too. And why not? The TV executives may already be down on the idea of pairing a black woman and a black man on a TV hour long show because they might feel that it would cause the mainstream audience to think it was a black show. Having a white guy takes care of that and we already know that Hollywood can't get enough of giving work to white guys anyway.
So the question to me is why do black male viewers treat Scandal like it is must see viewing. I go into the office and all the black dudes watch the show; they come across like a bunch of soap opera addicts. They don't seem to mind that it has a black woman who sleeps around only with white men. Maybe that says something about how more tolerant and secure black guys are. Nevertheless what's the point if the same open-mindedness isn't displayed whenever there is that rare show with a black male lead who is having love affairs with white women or non-black women in general? There is always tons of more hate mail and negative backlash when you put a black man and a white woman in the forefront like that, ant not just from white male viewers. Black women are often very loud in their disapproval too. Black chicks were hating on those Taye Diggs' shows Daybreak and Kevin Hill because his character was involved with non-black women. Those shows were not successful and not renewed which means TV execs weren't in any hurry to try such a thing again. TV execs are safe individuals who like to follow patterns rather than take a chance by going against the status quo. So in their minds hour shows with black men don't work. Ad hour-long shows starring blacks guys who are paired with women who aren't black, really don't work. Which means you won't be getting much or any more of that for the time being. But hour shows with black women who hook up with white men? That has already been proven to be a successful formula.