In relation to OP, obviously there won’t be a monumental shift towards any sales pitch on next-gen consoles. In the long term, there’s definitely going to be a larger success with sales from online companies like Amazon. There are so many factors that ties into the low sales statistics, especially considering the lineups are currently limited for the time being.
The more people find convincing titles, the more they’re willing to invest into next-gen. And honestly, going for the long and gradual route of waiting things out before buying isn’t really something rare to do in the first place. I won’t be too surprised if there’s some new renovations to the Xbox One (i.e. like how they did the Elite with XBOX 360) that may be better.
And considering how storage is a prevalent issue, it’s subtle things like this that would throw some people off from buying the consoles in the first place. And taking into consideration of the type of audience, clearly veteran gamers will be content with their older systems for the time being.
If one has been gaming for so long, at some point they’ll accumulate an experiential learning of how the trends in the games they play always have some kind of relative feature in the rudiments. So either people are just getting smarter and waiting things out instead of being steadfast into buying things, or something else entirely.