Haha... interesting replies to your thread. Not all that unexpected. Anyways, I will try and give you an unbiased answer.
These consoles have only been out for a year. And in the case of MS, they have already made improvements to the APIs which will allow devs better use their platform. Expect sony to be doing the same in some way or form. But thats just one part of the equation. Another part of it is that like every console before now, with more time devs get better at doing what they do with the consoles. They would continually find out what works and what doesn't work and how best to get the most outta their engines running on any specific console. And lastly, I expect resources like RAM tied up for the respective console OSs to be given back to developers at some point. Not a lot but enough to make a difference.
Having said all that I actually believe that with time we would either see more games hit 1080p on the XB1 or the XB1 will settle for being a 900p console (nothing wrong with that). I believe that majority of the games on the PS4 will be hitting that 1080p mark. GTA4 was 720p on both the PS360. GTA5 was also 720p but looked waay better than GTA4. No reason why such improvements from better all round knowledge of the systems won't happen this gen too.







