True.
MMA is still a very young sport and will continue to evolve just like BJJ. What surprises me more than anything is at how little JUDO is being utilized. Shocking really.
Well, much of that is because MMA is done without a gi, whereas judo is specialized for gi's (or jackets actually). That makes sense for much of the world (including Japan) where people tend to wear jackets (or at the minimum shirts) in daily life; if two people wearing jackets grapple, the one using jacket based techniques has a huge advantage over the one limiting themself to no-gi techniques. However, if people don't have jackets on, no-gi is superior to gi techniques. MMA is no-gi, so wrestling is going to work better in general.
Moreover, over the last fifty years, since the USSR(Russia etc) got interested in the Olympics in general and judo in particular, there has been a huge cross fertilization between wrestling and judo. Wrestling has long since adapted judo gi-throws into itself, and judo has (though many were eliminated with the change in rules banning leg touching) adapted wrestling no-gi takedowns into gi based throws (most famously, Kano wrote that he adapted kata-guruma from a book of western wrestling - of course what Kano used as kata-guruma is now banned).
Basically, wrestling adapted most of what can be taken from judo into no-gi decades ago, so there isn't much standing technique in judo left to be adapted to no-gi for MMA. There is the difference between crouched freestyle/folkstyle and more upright judo, but wrestlers who've done Greco are already used to it. And chokes/locks from judo are already covered (and more) from BJJ, which everyone learns.
This is a big deal. Judoka going into MMA have to get used to not having a gi to grab; this kind of transition takes years against high level competitors - a lot of automatic reactions have to be modified or even changed. This is why there are very few people (if any?) who've won Olympic medals in both judo and wrestling. As similar as they are in many ways, the gi (or lack thereof) changes things. And at high levels, the difference between a medal or losing in your first match in the Olympics is only a couple of percent in ability. Same is true for MMA; a judoka going into it is going to spend a couple of years getting the necessary automatic responses that a wrestler has learned over a decade of wrestling. That is a disadvantage, since like the wrestler they're also trying to learn striking and BJJ ... judoka have one more thing to learn than wrestlers, and that's no-gi.