Nice try. But paying $100 for a game and being locked out of activities that you previously could do but now you can't is not the same.
It is more like not being able to watch the season finale for season 1 of House of Cards until you purchase season 2.
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You haven't been locked out of any content. The game has been expanded, and the end-game (nightfall, heroic, raid, etc.) now takes place at the portion of the game that you didn't pay for.
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Quoted from below "Everyone that didn't buy TTK: "I'm getting locked out of content that I've purchased!" No, you're getting locked out of TTK content (which you obviously didn't buy) but can still play anything you've payed for."
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....which if you stop paying for the service would be exactly the case no?
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No because you cant go back and watch the 100 films you watched whilst you had service - thats the point. Even now; you still own the vanilla game and can play it if you decide to cancel your service (ie buy no more dlc). In fairness some content has been reduced - weekly etc.