Agreed. They are very far off right now though. For the most part, I think most Raid specs are pretty popular in M+ though. This changes in extremely high keys, not at M10 or so where it’s starting to happen already. You’re going to have some classes drop out - just like you do with EARLY Mythic Raids. That’s inevitable, and it should be considered acceptable since very few people actually participate at that level.
PvP is a whole different can of worms. However, as I mentioned earlier, most of the specs have similar play-styles and abilities within a class (with a few exceptions), so I don’t think balancing the specs would be as difficult as it seems.
Ironically, two of the three classes with both ranged and melee options are more closely balanced than those that are solely melee or solely ranged. Druid:Balanced/Feral Shaman:Enhancement/Elemental.
It is unrealistic. The specs need to be more balanced than this though. Again, I’m not terribly worried about the place in the meters as long as the specs in each class are close to one another. If that doesn’t happen, we’re going to end up with a lot of dead specs, and a lot of extremely disappointed players.