Speaking to Gamespot at the Brazil Game Show, Xbox boss Phil Spencer admitted this himself, stating that the Xbox One S would be the mass market mover for Microsoft this generation, not the One X. “Xbox One S will be the market leader for us.
The Xbox One X, much like the Elite controller, will be for a subset of users who want the very best they can get- but that subset is, by definition, not everyone.
While the Xbox One X has strong pre-order numbers thanks to early adopter enthusiasm, it is hugely unlikely sales of the device can keep up with a mass market product like the PS4 or Nintendo Switch.