All these articles claiming Twitter is restricting developers using their API are all missing one important distinction: Twitter is only restricting Twitter client developers. There are hosts of other developers who are using the Twitter API with no restrictions, those building value add services in Social CRM (social media monitoring, analytics, data reselling, sentiment analysis, etc). Yes, Twitter's new ecosystem…
Well, I think the point is, building Twitter clients use to be allowed, even encouraged, by Twitter. And now it's a big no-no. So even though they're only restricting new client development, the restriction affect anyone developing with the Twitter API. What's not to say the type of app you're building today won't be restricted tomorrow.