If they manage to keep older console games compatible and scalable for the next consoles, I'm looking forward to shorter lifespans.
All my PC games stayed compatible when I switched from a GTX 275 to a GTX 580 to a GTX 970, most of them look much better now (higher resolution, maxed effects) and/or run with smooth framerates (60 - 144 fps).
All my iPad-games stayed compatible when I switched from the iPad1 to the iPad3 to the iPad Air. Many of them run the same on the newer devices (fixed resolution, fixed settings), but many others look much better now (2048x1536 instead of 1024x768, better effects, better textures).
This compatibility and scalability could also come to home consoles if the stay on the chosen x86-path... and why shouldn't they stay on it? I'm pretty sure that the "Xbox Two" will be compatible to all XBO-games from the start and that most of these XBO-games will run better on the newer console, since Microsoft is integrating the Xbox-branch into the Windows-family, where backwards compatibility and scalability are common.
