This is a vary viable scenario. Here's the deal the drivers are way late for the X1 new SDK kits are going out really soon and already being said to be really fast and it makes achieving 1080p on X1 really easy with the new kits.
Apparently the situation is these new kits also give developers the tools they need to leverage the ESRAM in ways they had no clue.
Also MS will be dropping DX11.2 soon on X1 and when this happens you can store up to 6GB of textures on the ESRAM alone that's massive and will also make it really easy to achieve 1080p.
This is all true don't try to downplay it. When this happens and it's going to really soon the reality is that in FACT the X1 might flip the table and be the more capable box running full 1080p at 60fps because running 60fps
There is a lot of AM CRY coming gonna need lots of tissues soon.