I don't think there is even any controversy against that and no impediment for bitcoin to achieve such feat. Bitcoin has been and will continue to be a trailblazer in the world of digital payment which is what several people have been using including everyone on the forum. The challenge along the line to such victory is on the basis of government factor which will want to slow down such progress as we see it. Aside the government factors are the individuals who sees bitcoin as the way to dupe others of their resources without being caught by hiding under the anonymous feature of bitcoin. When you remove those two factors, I don't see anything stopping bitcoin of even going beyond the digital payment alone, but getting to the point of recognized as an official tender in various countries.