In the U.S., maybe. But then the WWE is in a completely different category, since it's an entertainment show, not a competition sport. Boxing on the other hand is still around, it just doesn't get as much exposure on TV like it used to. But compared to MMA, Boxing still brings in more money at the gates and for the fighters. You also have to keep in mind that almost every country in the world has a boxing program, some supported by their governments, while MMA is still a young sport and still has to firmly establish itself as a dominant sport in other countries.