Sure, I don't think the Xbox 5 will be a success, but it's highly likely it'll still ship far more units than the Gabecube, simply because Microsoft is able to shift more units as a larger organization with more presence everywhere (including in the retail space and online stores other than their own).

The difference is that for an organization the size and bloat of Microsoft, numbers that would make Gabe happy would be disastrous for them.

No consumer actually cares about minute differences in performance (or other aspects) between different operating systems and platforms. People buy the platform that has the games and meaningful features they seek, like for example portability, Nintendo's second-strongest pull after their IPs. Microsoft is hastily trying to claw back their exclusives after a disastrous abandonment of this strategy, which sent margins down the drain. Yes, this will mean that they'll continue serving the PC, so you can play most of their games on Valve's devices or any other gaming PC as well, but once more: Normal people buy what's on the front page on Amazon or on the most illuminated shelf at their local store.

The overwhelming majority don't even configure their task bar, for crying out loud. Seeing an unmodified one with the big useless search box, spam widget, applications they are never using is one of the quickest reliable indicators that someone is not a tech person.