I agree with your sentiment. Good for us, good for them, good for our nation. The problem has always been one of approach. Most pleas for Republicans to woo black voters have been disguised calls to be Democrat-lite in policy and rhetoric. You are not suggesting this, but there has been the assumption in the media and politics that "reaching out to blacks" equals handing out goodies. To some extent, this is true. The Republicans did not abandon blacks, their platform works as well for them as for everyone else. Blacks, as well as other groups of non-white, non-married or non-Christian voters, simply have a different view of government and society in general.
The electorate is becoming more and more racially divided. This is generally embraced by the Democrats, particularly with a mixed-race POTUS in office. Their rhetoric has become very anti-traditionalist and, by extension, anti-white. I agree that somehow convincing even a modest percentage of black voters that Republican/conservative ideals are good for them would be a great thing. It is difficult to do. The Republican Party would do well to amplify its appeal to white voters, actually. There are many whites who will vote for Romney or simply not vote this year because they have been turned off and angered by the racial aggression from the Obama administration and media.
Republicans should realize that a lot of their current supporters arrived on the Right initially due to being fed up with affirmative action, racial politics and the pushing of white guilt in their schools and culture. As a young man, I was a liberal. After being constantly told I was the enemy, I realized that the Democratic Party was not for me. We should not alienate blacks on purpose, and I liked Romney's approach during his NAACP speech, but we must not alienate whites at all. The real danger to the Republican party is that it becomes the centrist party and an increasing push for a White/Right third party begins to split the conservative vote and ensure that Democrats win national elections easily.
No, he real danger to the Republican party is that they have become a bunch of whimps afraid to stand on pricipal because it might offend someone and loose them the 2% margin they won their last election on.
That is what was encouraging about Romney - not that he gave offense because he was pretty civil, but that he took control of his agenda, didn't let someone else control it for him, and didn't worry about the fact that someone might not like the fact that they (Lehrer, Obama) were not able to set his agenda for him.
"Never let the other side frame the issue." - Denny Crane