For the Xbox line as a whole this is very likely. Between the R&D costs, the RROD issue, two out of three released consoles failing to be the lead platform of their respective generation,yeah I think Thurrott is right. The upside is that Xbox is a recognizeable brand and probably the only Microsoft product in the last 15 years to have really resonated with the average consumer. So even if it hasn't made a lot of money yet it's a valuable brand for Microsoft and it's bringing in the MAUs. That's also important in a world where Microsoft's consumer-facing services aren't exactly dominating (email, maps, search, messenger and so on.)
That said, I have no idea what the Xbox platform will morph to in the future. It seems inevitable to me that eventually, maybe as soon as next gen, the Xbox will merge with Windows gaming to essentially form one platform. Sony is beating Microsoft handily in the console space but the world's biggest games are being played on a Microsoft platform (Windows.) If Microsoft wants to beat Sony in any region other than North America it needs to take advantage of the PC gaming landscape. The fact that PC gaming has gotten so big worldwide and Steam dominated digital game sales under Microsoft's nose clearly demonstrates the lack of vision and forward thinking of Microsoft's previous leadership. The jury's still out on the current one.