Users are unlikely to enjoy the service if their messages don't have an audience. After a year is up I bet people will tire of having to use both Twitter and App.net, and stop paying for the latter. How many App.net users have stopped using Twitter? That's an important metric to pay attention to over the next year. I predict it will be near zero, and most people aren't willing to pay in money and inconvenience for an ad-free product. Especially when they could just install a couple of extensions and get the same result with products that actually have an audience.
>>natriu+(OP)
> How many App.net users have stopped using Twitter
Even before APp.Net I contemplated leaving Twitter because of the noise, the push towards ads and the general climate toward third-parties. I certainly would not use Twitter without TweetBot.