Considering Sony's habit of showing CG and fake specs
... at least we are starting open minded here
.
Not even the PS4 is showing that big of a jump anymore. The laws of thermodynamics and diminishing returns have kicked in.
They have been kicking in for a while, you need a bigger and bigger increase in specs and performance each time to notice a smaller and smaller visual improvement given the same performance delta so to speak (although IQ improvements are long overdue and WILL make a noticeable difference IMHO). One thing that will help the next generation is that the console makers had a lot more time to let technology evolve before launching a successor compared to before and Orbis/Durango vs Wii U specifically we are talking about quite vastly different thermal budgets (~40 Watts vs what... 150+ Watts or so perhaps?).
Still, the beauty of this is that we WILL have answers... 6 months or so after Orbis and Durango launch we will see how well they used their launch windows and how the games they have available will deliver compared with the average throughput PS3 and Xbox 360 delivered throughout their lifespan. You can make some adjustments, you can give it the "it's a launch title... let's compare it to how the previous generation's launch titles differed from titles further down the generation..." benefit of doubt, but I think people should still expect not to be disappointed comparing the brand new console to the previous generation of consoles.
I do agree that it will be harder and harder to achieve due to "simple" physics issues, but I am not sure we are even close to that point.
Still, as I said... you will be able to compare how launch window titles for Orbis and Durango will compare to PS3 and Xbox 360 games throughout their life spans and you will then examine how they fared when the result of that comparison is shown side by side with the comparison between Wii U's launch window titles and PS3 and Xbox 360 titles.