so you think the estimation is really far off?
Pretty much. At the least, I wouldn't put money on it.
Europe is ignoring the Bone and in Asia, it might as well not exist. The 57 million being predicted would have to come almost exclusively from the UK and US, and I don't see that happening, especially when those markets are still skewing PS4.
Edit: Anecdotally, while I was working in Malaysia, stores didn't even bother to stock the Xbox One or games for it.
No one was buying the thing. In Australia, the Bone is much more visible, but personally, I don't know a single person who owns one, whereas nearly all my core gamer friends own a PS4. The situation is worse with more casual audiences, who with the exception of those who played Halo and CoD on the 360, don't seem to be aware of the Xbox One.