So ... Level 120. It is twice the maximum we had when WoW started.
Would further increases in Level do us any good other than wiping the Gear-Slate clean again? Would simple increases in ILevel not accompish the same with future expansions?
What does our level even express anymore? Gameplaywise it was once a key to the content we were able to play, at least from 1 to 60. A guide on where to go next in Burning Crusade and Wrath of the Lich King, with places and stories to be discovered that were left unexplored and unsolved for years and years since we played Warcraft III. Cataclysm was the first expansion introducing truely new concepts soely original to WORLD of Warcraft. But ever since then we all knew what we had to do. Get to the max level, period. Not to get to see new content but to see the "real" content in the Heroic Dungeons we already beat. Pandaria was all the same in that regard, unlocking the whole Rep-Grind then and only then. Warlords needed the leveling as content padding. Legion started the trend of "We don't care what you do anymore as long as you do something." Leveling in all expansions past Wrath of the Lich King was simply an arbitrary time-gate.
Story wise it expressed our character's growth. Going from a simple squire or apprentice to becoming a capable adventurer going to more dangerous parts of the world and finally a hero capable of felling dragons. Then demons and the mightiest characters we have known in warcraft's story since then. We became not just any kind of random hero, but the hero of the alliance or horde, feller of the Lich King and defender of Azeroth. And then? We helped out Thrall taking down Deathwing, but we already showed we were capable of fighting old gods. We found peace with our inner self and conflicts in Pandaria and helped take down a mad warchief ... twice. We raised an army of heroes, warriors capable of striving to become as good in protecting the world as ourselves. Considering what we did before, this all was just busywork. Then in Legion we first felled more corrupted beings, then mages, warlocks and demons. Stakes that, considering what we have already done, were not really high. Then we marched upon the Legion itself, defeating demon after demon after demon of ancient legends. We felled the avatar of the mad titan himself, all of his leutenants, just to march upon his source of power itself, going so far as to even fell not just one but two titans in succession. What the hell is out there to even stop us? What would a Level Up even mean?
I say that as a final representation of our growth, Level 120 should be the final one. Getting to 120 should place a Crown upon our character's portrait and simply say: "You. Are. Done!"