While ranchera music was very popular throughout Latin America from thee 40's to the 70's or later, that was due to the Golden Era of movies in Mexico. Those movies tended to have ranchera artists unless they were teen flicks from the 60's with Enrique Guzmán, Angélica María, César Costa, Los Holligans and friends.SBS had been rumored to want an outlet for Regional Mexican, so they could cover all New York Hispanics in a combo buy. The genre is hot right now even if Dominicans and other people from the Caribbean rim do not listen to it, but there is a huge Mexican and Central American population who do enjoy that music.
Norteña was never of significant impact outside of Mexico, and even there it was, indeed, "regional". Banda is not widely heard outside of Mexico. Current "regional Mexican" music is one of those two genres or variants of them.