What really needs to happen is an open decentralized protocol needs to be agreed upon for newsfeeds + blog posts (wordpress) + microblog (twitter). Then everyone can write their own servers and clients and operate in a manner like Email currently works.
Then do it. Make everyone look like idiots for not doing it sooner. Make it so cool I have to sign up.
As a developer, I never thought once about building an app or integration for Diaspora.
That's why App.Net might have a chance -- he's making this about targeting developers. There's a reason Apple has spent millions marketing different 3rd party apps -- and the whole ecosystem via "there's an app for that". There's a reason "killer app" is part of our lexicon. There's a reason Steve Ballmer jumped around on stage screaming 'Developers!' and there's a reason XCode is free now.
Building it is not a guarantee that they will come. But it is a prerequisite.
Are there really that many developers clamoring to build new apps on yet another closed, for-profit, centralized social network with no users? I sure don't. I'm already done with Twitter and Facebook apps, the centralized model is simply not the way forward and I can't be alone with this opinion.
Techcrunch posted an editorial a while back that I agree with:
http://techcrunch.com/2012/08/03/the-federated-web-should-be...
That said, there's already a working Twitter-like distributed network. I hard my own StatusNet node running on my personal server and getting messages from people on Identi.ca, until I realized that I found the idea of the platform interesting, but not the platform itself (nor Twitter, for that matter). The fact that half the accounts were abandoned didn't help either.
StatusNet actually sounds kinda good. Why isn't it more popular? I'm not sure, perhaps people need something more than just a replacement for Twitter. I think something that will eventually become successful will be some sort of multi-use low-level protocol that handles many types of "social communications", for example: Twitter + WordPress + Private IM + Voice Message.