If posters here are indicative of the overall, it would mean that many would simply leave the GOP. Call it a political "white flight."
I mean, hey, if blacks vote GOP, it must mean that the GOP is "pandering" to them and selling out "conservative principles." Why do I say that? Offer a thread on how to go after the black vote without pandering. 80% of that thread would consist of terms like, "won't happen," "they'll never leave the Democrat plantation," "the GOP needs to stop pandering" (even if there's no pandering in the article posted), "they vote 90% Dem and that won't ever change," etc. Very few, if any, suggestions would be posted on how to pull it off while remaining true to the GOP platform. So if the GOP tries, it's pander, pander, pander.
This does not mean that most white Pubs are racist and/or bigoted. But it is what it is. And I will stand on this post with both my size 15 shoes.
What would be your method of approaching a particular minority group, without promising them something special? How does one dialogue with a minority group, without pandering to them. It seems a bit different than other interest groups, say gun-owners, who have the weight of burdensome legislation to complain about.
It occurs to me that there is the Thomas Sowell approach of repeatedly point out that things like housing regulations, cigarette, and gasoline taxes hurt the poor (and therefore, minorities) the most.