If I were buying a 7" tab right now, it would be a Nexus. Right now, it's the best value in a 7" tab. It wasn't around when I purchased my Fires. Back then, the Fire was the best value in a 7" tab.
I will not, however, replace my Fire with a Nexus. For my needs, it's an incremental improvement over a device I am very pleased with.
I may get my wife a new tab for Christmas. By then, the N7 will likely be eclipsed by other 7" tabs -- possibly even a new Fire or iPad. I wonder if the author of that article will be trading in his Nexus for something else?