The article implies the Xbox One, and really any console, is likely to sell "similar healthy numbers" given adequate supply. A statement/implication that doesn't really stand up to scrutiny.
The Wii U was not supply constrained as the article implies, for instance, as readily evidenced by Nintendo's shipment information. In general the Wii U comparison people bring up is poor, there's no way to determine when sales began to collapse to the point where it was selling like 11.5K/week in January.
PS3 also wasnt that much supply constrained either, right? I vaguely remember people taking pictures of available stock in December?