The EFF can defend its mission in multiple ways. One, as you point out, is offering an alternative solution all agree is better. This is fantastic if you can find a feasible solution everyone actually agrees is better but there is no guarantee such a solution is going to be found until after you've managed to find it. Another way for the EFF to defend its mission, as this article aims for, is to make an argument the loss of what the mission is trying to protect is not worth the gains made by tossing it to the side. You can be unpersuaded and disagree with the balance but the lack of alternative solution alone isn't proof of a bad response.