Like I mentioned before, the best and quickest way for it to be accepted by society is for the media to promote it, which it has. We are seeing countless commercials (both on television and print) showing interracial couples. We are also seeing television shows illustrating interracial relationships as well.
The same thing happened within the gay community. They really weren't getting a lot of traction, and now, it's offensive to point out that he or she is gay. The proper approach today is to silently acknowledge it. Media played a huge role in getting society to accept gay relationships in all its forms.
I think the largest stumbling block will be the acceptance of open relationships - where the man or woman has outside lovers and the spouse accepts and promotes it. There has been some television exposure on that lifestyle, but not much. I'm pretty confident though, that with the emergence of women in leadership roles, it will become accepted, albeit slowly. From this, the interracial 'outside lover' will be introduced.
Thus, in my opinion, it's just a matter of time.
Donna