If Sony doesnt have some form of DRM and MS does Sony are just tossing decent 3rd party support out the window.
Sony really are in a touch spot here. If I was them I wouldnt rush into anything.
If I was them I would be having meetings with gamestop and other large retailers and asking for used game sales profits to be shared with them and publishers.
If GS doesnt want to share then Sony can DRM and take it by force.
It's an interesting thought, perhaps Sony and Microsoft are using threats of online DRM as leverage to get a bigger percentage of used game profits. Given what happened with Gamestop's stock after the initial rumors hit with MSoft, I have to believe it's a pretty big bargaining chip.