The graph on tops (Courtesy of Personal-View) shows the percentage of cameras (produced by Japanese companies) that have been shipped to different regions in October 2013.
As you can see Mirrorless Cameras are selling as well as DSLR cameras in Asia, followed at distance by European countries (where DSLR still has a small advantage).
The only region where mirrorless acceptance is very low is North America (mainly USA).
Please note: The graph only shows the percentage of distribution of the cameras. The total number of shipped DSLR is still greater than the total number of mirrorless cameras.