MS will have to walk the line between 'strong encouraging' studios to optimize for the scorpio and not alienating potential partners.
It may end up a mess both ways (Sony takes the same risk). Games that run like shit on the lower end machine and aren't good enough to justify the higher end.
Any game can run on old hardware it just needs lower poly models and cutting effects. Just like a low end PC would. This is good for MS as the newest halo looking like poop on old consoles will arm twist people into upgrading while still maintaining a large user base.
lol c'mon it is the same hardware in PC and consoles... same AMD FLOPs... there is no way to be different.
What you are talking is optimization and not FLOPs.
The reason comparing TF is meaningless is directly because of optimization and the lack of hardware variety in the console space allowing better performance per flop. PC hardware can flop like crazy and still stutter on shitty console ports which happen all the time. A console will always go further on less power or TF.