No, drawing a distinction. The unique features are selling points, that sell the platform on the merit of its ability to serve its purpose. Brand loyalty, especially the extremes being discussed here, are about buying the product irrespective of its ability to do its job, based solely on the fact that someone loves the brand so much they'll buy it beyond all reason. There definitely exist hardcore MS and Sony and Nintendo fans who'll buy their next console regardless because it's the next XB or PS or NThing, but they represent a tiny proportion of the market. Everyone else buys on what they consider the best option available at the time.
So going back to iroboto's statement (which he's since refined), the notion of Sony (or anyone else) aiming to do as well as possible now to secure future sales of the next console is unrealistic. The mainstream will buy their next console based on what's available, with past positive experience with PS4 a part of those considerations but far from the deciding factor. Such that if Sony release an overpriced turkey, many consumers will have no problem ditching PS and buying something else despite positive PS4 experience.