I would agree with your last statement, but in the case of Xbox i think it is by design. They already excitedly talk about windows handhelds being the future and its because the console market has almost always been a loss, even back to the Sega selling massively under production cost to try and take ground from Nintendo. Games were always what made the profit.

In the case of Xbox, their business model for a long time has been moving to a live service streaming model, i don't think they want to be in the console market. If they can move their app on all kinds of devices, they can skip the investment of the console and instead focus on what the real profit driver was all along.