Lol UFC actually promotes all martial arts bud, mma is just that mixed martial arts you have to learn it all, BJJ use to dominate in the early days until stand up fighters started perfecting what they call a sprawl which defends against take downs now there is no one art that dominates they all have strengths and weaknesses, Machida for example is background is in Shotokan karate and bjj, he is a very awkward fighter cos of his style and is or was the light heavywieght UFC champion. GSP learns karate, bjj, greco roman, thai boxing and boxing and judo, Fedor leans judo, boxing, thai boxing, sombo, judo and variety of others. If anything UFC promotes all martial arts. Anyone who goes in there without a background in at least one particular art and tries to learn it all together normally dont do well, they become jack of all trades master of none. They all specialise in one art and then adapt other arts to it.
Me, I'm a black belt in Pringles, once I pop I just cant stop