Then only buy once every five years or whatever and play the same games that the rest of us would be playing only at a lower resolution or graphics setting.
Not seeing why this model has any negatives other than a marginally increased testing overhead for developers.
I'm not trying to make some argument on my own behalf. I can either chase the best specs and experience, or just use my PC since it's already high end. I can use the Steam streaming box on the TV now too, so I have the PC covered. If they're going to converge then I don't need the console.
I'm trying to look at this from the more mainstream perspective. Most people I know just buy a console and use it for a long time. Still, they're very aware of the differences between the Xbox and PS4 this generation, so if they're using MS product then it's out of Xbox Live loyalty, or love for the controller. I don't see the public that's had their attention glued to the performance delta this generation, buying into an ecosystem where it'll take frequent upgrades to not be on the wrong end of the performance equation.
For all the talk about a modular console.. I'll believe it when I see it. I don't think for a moment that people are going to be buying console CPU and GPU modules at Best Buy. If this upgrade approach ever happened, the best realistic possibility would be an upgrade discount off new models for owners of previous SKU's. I doubt that it would be sufficient, however.
A random crazy thought, maybe Microsoft will leverage the movement away from traditional cable set top boxes to rent us a new Xboxes to handle all of our gaming and TV needs. Then we can just pay an upgrade fee and they'll ship us a new leased Xbox. We get rid of cable rentals and simply move all of our marbles over to MS, losing/forgoing traditional physical game and console ownership in the process. End users get cross-buy via digital media and easy to upgrade hardware in the process. The device could handle traditional cable TV, OTA antenna, or a PS Vue-type content delivery on the same device. I mean hey, why not... everyone's just speculating anyways.