In all honesty, I can't believe it's taken this long to get viable high end content/gear in activities other than raiding. This is coming from someone that was a hardcore raider for the first 3 expansions and burned out from it. Mythic dungeon for high level gear sounds like a dream come true for my old wow friends that burnt out on the raid scene. The best times we had were in dungeons, it's so much more of a personal experience with a smaller group of people.
With normalized pvp and zone scaling, there's just no real excuse to not have high end gear coming from multiple sources that aren't raiding. I've always understood that the high end raiders want to have (and need) the best gear. But I have also always thought it was incredibly lazy of blizzard to only cater to those people when it comes to the coolest items and gear, because you can make very challenging dungeon experiences. Also, a lot more people will experience it. For some reason, to me dungeons that were really difficult (especially vanilla) always felt more rewarding and 'heroic' than raiding. Mostly because raids felt so clinical and there was so much potential for drama. I always felt like I had a more important role in a small group and it is MUCH easier to see how "good" someone is at their class when they're on the hook in a small group and have to have extensive knowledge of their class and use all of their abilities.