Asmongold trying out FFXIV is sort of a long time coming. WoW has been falling apart and the main reason a lot of streamers were sticking to it exclusively was the views they got and the fact it was a very nostalgic game. A lot of people played it back in the glory days and gave up later on it when things turned sour.

Bellular and other content creators also moved to play FFXIV and are actively promoting it due to the direction World of Warcraft was taking. My own opinion is that WoWs days are numbered. WoW Classic was the last big hurrah: A swan song to a once great game that tons of people loved.