I'm old enough to yell at you to get off my lawn. It only takes one cruise around the forums at all the complaints about locked content or timed exclusives and so forth to know if they tried to really build on the base game through expansion it would most likely fail.
The Dragon Age devs won't even allow DLC party members because it would have required hooks on the disc to make it happen... that alone says a lot about their target audience.
EDIT: Or does nobody remember the world going batshit crazy when Microsoft thought they could go all digital? "Oh no! I can't buy my games used and save $5?"
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Very true