The only reason this might be viable is if the projected tech, for a small jump in price, allows them to offer a serious bump in fidelity. Perhaps a 4k version for everything? Hardware enthusiasts will know what might be possibly for an extra 100-150 more) Advantages for this would be not having the competition offer more powerful hardware at launch for marketing purposes, while also not having them sell all of their base hardware at a loss if they were to set the higher spec as the standard.
On the other hand, it eliminates the strategy of an effective mid gen refresh like the Pro, creates a split in the userbase, offers more potential technical hiccups and kind of goes against the idea of Sony keeping it simple, which worked wonders for them this generation.
My guess would be that they will hold off for a few years, so they can target not only new gamers but also existing owners who want an upgrade.
