As an owner of the original xbox one I feel I should defend it despite the wifi chip failing in mine.
Of the 30 million xbox one consoles sold the vast majority are this model I would of thought. There has been a decline in xbox one sales with the recent slimmer models maybe they have confused the product line up or the greater range of ps4 software has moved more potential buyers to that platform but whatever the reason I would say it has been a successful model which is not proven yet with the later models. Yes the later models are better actual models though but it is often the case maybe they weren't improved enough to continue momentum of the platform commercially. It always felt to me that Microsoft needed an economy value model yet if anything went the other way enhancing functionality with a more premium appearance. The fact they can now use external hard drives meant a smaller console with flash memory would have been possible at a much lower price.