Those of you familiar with evolutionary science might be quirking your eyebrow a bit, as did Of Teeth and Claws, where it was pointed out that mutation is a part of evolution. Continuing the analogy, it's a part of the slow improvement we see in our genre of choice, as the source leading to feature implementation and improvement. And as Killed in a Smiling Accident added, evolution is not a straight line, nor does it select features based on inherent quality -- the current "standard features" have evolved because they're best at succeeding in the current environment (that is, the market).
Ultimately, aside from fascinating extension of the analogy, the biggest point to be taken away from both this discussion and the previous one is that change in the genre isn't something which will happen overnight. While the powerful influence that World of Warcraft has placed upon the genre is beginning to abate a bit, it'll be quite some time before it's discarded wholesale.