Recently, Sankaku Complex posted an article talking about how much trouble Nico Nico Douga is in financially. In Japan, there has been a sharp decline in traffic to the site most likely due to Nico Nico Douga removing a lot of the anime content that infringed upon copywrite holders. In an effort to help boost traffic, international versions were an obvious choice. While there was a Taiwanese version of Nico Nico Douga, it did not help boost traffic significantly.
You may notice that there is still not an English version of Nico Nico Douga. Asiajin suggest that the reason may be due to the fact that if an English version were to be released, Nico Nico Douga would see a huge influx of traffic and have a hard time handling it. So will we ever see an English version? I will almost bet money on it. But, we may have to wait till Nico Nico Douga is a bit better off financially so they can afford the server upgrades.