I never said it is endless. Yet, it is enough to give character progression to its intended audience.
Also, the cap is being raised thruout the lifetime of the expac.
A world quester (and i mean someone who plays world quests only) has an ongoing character progression. I do not talk about a mythic raider who outgears world quests very fast.
For whom? It seems to me it takes enough time for most players to get there.