People have this child like mindset of products, we are creatures of habit. WoW will still be the biggest mmorpg 10 years from now, and neither ff11 or ff14 has seen significant benefit from the anger about blizzard. Most WoW players won't leave WoW, of those that do it won't last long.

Streamers have far less impact on players than people think they do, and not only that but WoW players are angry with ff14 for causing this in the first place. Ff14 is the last game they would move to.