Great article, Jez, as always. It's such an odd dilemma, because we see the huge investments MS is making in gaming, at least via acquisitions. It reminds me of fueling and burning a bonfire in wet weather where the fire spreads out but literally spreads too thin and burns out:
It's impressive to get it going (launch the platform), and once lit, there's a good hot core of coals (the core Xbox fans) that help it spread (new users and form factors). If the fire spreads to the periphery without the heat needed to sustain the flames (the horizontal growth without care for the core users), it will eventually spread outward to cover a larger area, but with less heat. The edges can't sustain their burn under the constant counter of the rain. The core heat keeps it all going for a while, but if more isn't added at the core, it all just peters out, having burned through its fuel.
Maybe not a perfect metaphor, but that's how I see Microsoft handling gaming, Windows Phone, music, many things. They start strong, expect the spread to drive growth, but lose the core needed to sustain and let the new flame burn out.
Having said all of that, I do think this could all turn on a dime as the first party games start coming to market. During the 360 and PS3 era, it was Sony who was on the ropes in spite of arguably better technology (the BluRay drive and Cell processor). Great first party games don't fix the UI, but they do fix the main concerns that affect sales of the console and brand preference.