In the tradition of shitty "journalism" at the Verge the author is trying to convince others of something so they can be hailed as a technical prophet.
Microsoft has enough money that they can pour it into Windows Phone for a very long time and not bat an eye. The Windows Phone platform will only die if Microsoft loses interest, not because of poor market performance.
That being said this article is full of weapons grade stupid. It claims that last quarter 400m smartphones were sold yet only 1.1% were Windows Phone devices. That's a small percentage but works out to 4.4m phones. If the ASP (average sale price) is $200 that's almost a billion dollars in revenue for the quarter. While that's nothing compared to Apple's iPhone revenues it's not anywhere close to zero or any number less than zero.
Yet again someone trots out a "market share" number as if it is a meaningful comparison of anything. As has always been the case market share percentages don't need to be large in order for a company to be making money. Apple's "market share" of the overall PC market is likewise small compared to all PC manufacturers yet they make an enviable amount of money off Macs. They make a ridiculous amount of money off the iPhone despite Android "winning" with market share percentage.
You can compare revenue, profit on that revenue, and unit sales. Share percentages are virtually useless when trying to gauge the health of a competitor in a market. They're used by "journalists" that don't want to bother with math or real analysis.