Well for one thing it denies them a highly-anticipated game. Or ruins it perhaps.
But it's ultimately just a game. I loved SimCity. When I heard the next one was online, I shrugged and moved on.
Would you feel impacted if they ruined the upcoming Hobbit films?
No.
Would you feel impacted if they made the Super Bowl pay-per-view?
No.
Would you feel impacted if Slashdot decided to cover celebrity gossip instead of nerd news?
No.
You can choose not to participate in any of the above. Doesn't mean it won't ruin your day.
Then maybe people need wider tastes/interests, along with a sense of perspective and more emotional maturity, if these singular things can ruin their whole day.