They have sold more than 10 milion copies at launch. They spent more than 200 milions on marketing. They have the money, so there's no excuse, they can finish the game (which means adding content in terms of quest design, choices and consequences, reactivity to player's choices, activities in the open world). If they won't do it it won't be because of lack of money.
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Not entirely true. They have clearly built the itemization and the core gameplay as a looter shooter, to make the transition to the multiplayer easier. The multiplayer has ruined the singleplayer.
the core combat gameplay involves Guns, which is a big part of the source material.
however the gun play is RPGized and stats/level/build matter most. The overall gameplay is most defined by RPG standards. Quests, interactions, story. You also can completely ignore loot via crafting/exploration. The looter shooter concept has killing and random drops as the main progression loop. This games progression is mostly quest based, and doesn't require killing at all.