Pretty much this. I mean, in the bizarre world where we have a Trump Versus Oprah match up, I wouldn't be thrilled but I also know Oprah is (unlike Trump) a pretty smart woman and an /actually/ self-made billionaire. In all honesty, I'd feel like there's a certain poetic justice to him losing to a black woman that's everything he pretended to be.
I mean, I don't want Oprah to run because come on, celebrity-driven politics is pretty obviously terrible.