Nah, you've got it backwards kid, the UFC's success wasn't built on BJJ, it was the other way round. The UFC's success was was built on the god old Bloodsport/Kumite spectacle of fighters from different styles fighting "for real".
Besides, Royce was far from the best BJJ guy at the time too, and even high-level wrestlers, kickboxers etc who've taken up MMA have recognized the value of BJJ-style fighting when they've come to MMA. Alistair Overeem and Mark Hunt are K1 champions and both have studied a bunch of BJJ. Hunt in particular struggled mightily until he began to take the submission game seriously. Olympic wrestler DC has studied his share of BJJ, especially after seeing what Werdum did to his wrestler buddy Cain. Holly Holm was a boxing world champion and she lost her belt to BJJ.
Only a noob fool could follow this sport and fail to recognize the legitimacy of Gracie Jiu-Jitsu.