I've been playing WoW since early BC, and have raided every expansion in the hardest difficulty possible. After seeing how raiding turned out in WoD, I really would care less if I raided again, as long as their was meaningful ways outside of raiding to advance my character.
If Blizzard took out instanced raiding, but had:
Mythic+ dungeons
Crafting
World Bosses
"Hard" quests/world events
... I would still play it and probably like it more than how it is now. How does everyone else feel? Does raiding still feel as "epic" as it did 5+ years ago? I could really picture myself doing hard 5-man Mythic dungeons, hunting down rare items to craft powerful gear, and doing world bosses to advance my character.