I think Twitter should reverse course on this whole thing. Replace the now-deprecated third-party client APIs with new ones, let third-party clients flourish, and figure out a way to make money from them.
Sadly, we all know that won’t happen. I’m not even sure it’s the right path forward. If we want an ecosystem of third-party microbloggers, I think Manton has found the better path. His micro.blog clients are the first “indie web” apps I’ve run across with a great user experience. The open nature of the service makes it possible and desirable for other great apps, like Icro, to flourish.