I think the article was trying to couch this more as a "barbarians at the gate" piece with Microsoft in the role of the Huns, but that analogy falls pretty flat given the amount of innovation going on in both companies.
What I found really interesting is that Apple isn't really mentioned. Yesterday I got a push notification on my iPad about all the new things Siri could do. I'm not entirely sure how to interpret that but I'm guessing the race is on to make the voice inputs more functional. That, for me at least, is a part that makes something like Google now useful or not. I've been developing a habit of adding reminders for things to do when I get into work and that helps keep things from dropping off the plate, prior to location based reminders it really wasn't frictionless enough for me. And the pre-processing of things like flight iteneraries has stuff like the flight confirmation code easily accessed.
The bottom line is I can see the path to a mobile device I talk to, and it talks back, much like an executive secretary, to keep the important bits in order so I can focus on other things. Is Cortana winning that battle? Siri? Google? Hard to say, but the battle is definitely engaged.