Endgame RAIDS

Hear me out, and listen close. To spice up endgame down the line, would it or would it not be incredible to have 8 player RAIDS. Similar to MMOs, and would require a party finder system to implement. Make super hard 8 man dungeons that lead up to boss fights. Tune it so it's incredibly difficult to accomplish, and reward us with super rare loot drops (think cosmetics, pets, or special uniques, etc). Similar to MMO format. I just have a feeling it would fit so well in this game, and would give a lot more meaning and replayability to the end game content. Flame me if you will, but you know you want to consider it as feasible! Go ahead and reply with some theory crafting along with me and lets give GGG some spicy ideas.