Xbox One probably will eventually slow down in sales like the Xbox did back in the 6th Gen, but it is going to end up in second place overall. There are three reasons why.
1) The Wii-U is basically dead, with a poor holiday lineup with next to no AAA games. Its almost certainly getting replaced by the NX in 2016, with most of the supposed Wii-U exclusive games ported to it.
2) Microconsoles like the Ouya have flopped as few people wanted to play games intended for a tablet, only with a cheap controller. Porting a wireless controller driver to Android and calling it a day didn't work out for them.
3) Theres still a market for people wanting an all-in-one gaming and entertainment solution. Xbox One has better media playback features than the PS4 and backwards compatibility, while in comparison PS4 has better exclusive games.
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