I'm a relative newcomer to this bracket, and I would have preferred to just stay on the sidelines and observe the debate going on here. I would just like to address the references to other ESports and the adaptability of their meta-environments; specifically League of Legends.
Let me preface my opinion with the fact that I ended last season in Diamond (
http://www.lolking.net/summoner/na/30976171, some of you will recognize that account name with my one of my IGNs), and I had the honor of playing with some of the players who represented North America in the LCS. I was also in a position to hear their personal opinions on the evolution of the meta of League of Legends, and I consider myself qualified to paraphrase their views here.
League applies buffs and nerfs, therefore changing the meta, based on the findings of its own balancing team. It does not change the meta based on public outcry, although often times the findings of the team coincide with public outrage over imbalanced champions/items/etc. The general opinion of the most highly skilled players in League is that most often Riot Games prioritizes lower levels of competitive play (where the population is larger) over actual inconsistencies in balanced gameplay (as would be indicated by the level of play closest to "perfect"; i.e., professional play).
I'm not sure that WoW 19s has the equivalent administration or population to reference the style of changes that Riot Games makes to the meta of League of Legends. They are very, very dissimilar. The equivalency would require there to be hundreds of TC teams and an administration that was capable of performing copious internal tests in order to tweak numbers.
