You don't think Nintendo would drop the whole current strategy if they could get back the Wii success again? Because I think they would do that without even thinking. Granted, the Wii also had great Nintendo games of course.
But how is Microsofts strategy any different? They have had three great exclusive games this holiday (Forza Horizon 2, Sunset Overdrive, Halo, although with launch issues now that should never happen). They push monthly console updates with features people want also.
Sure, a moment might come that Microsoft goes full digital and that might be a bad day for consumers. But at that moment, those same consumers have the power to say "no, I don't want this, I get another platform to play my games on."