We are at most, a few months away from apps with content and sharing mechanisms just not possible on Twitter or other centralized, closed-source platforms. That's when the momentum will really start to build for Activitypub and other protocols supporting federated networks. We have stop talking about it being a twitter "alternative" and start talking about is as an evolutionary step forward in global social networking. Because that's what it is.
@shoq I don't disagree, but that means some kind of "alternative" to the "Alternative to twitter" use case needs to start being broadcast. Something pithy that folks can grasp (read: tech journalism can't casually malign due to status quo relationships and more general audiences can wrap their heads around with a de minimus of effort).
Not impossible, but I'd argue still not facile.