The average age of WoW’s player base is going up over the years. Every year the demographic of players who no longer have the time to deal with the hurdles and drama of Mythic roster management grows.
Meanwhile,the brain trust of player raid knowledge gets bigger, and there are more guides, addons and tools available to help conquer raids.
The result is alot more guilds who have the capability of easily clearing heroic relatively quickly, but also don’t have the time or patience for Mythic raid roster management.