We don’t know why we need new consoles yet, and that’s part of the fun
The short answer to the headline of the linked story is that we don't need new consoles. Nearly everything we talk about in PAR is a want, we deal in desire and not requirement. That being said, the point of the story stands: We don't really know how these consoles will change gaming, and that's pretty great.
Think of the games you've played on the PlayStation 3 and Xbox 360 in the past year and remember that they were created with 512MB of RAM. Pretty crazy, right? The amount of optimization that consoles allow is crazy, and the first batch of software for the PlayStation 4 and Xbox One don't really show us the capabilities of each system. That will come later.
It's a perfectly fair move to wait for those games to come out, but it's also fun to get into the next generation on the ground floor so you can watch it all happen in real time. This story has me more excited than I was before about the new consoles, and I had thought that was an impossible task.