1) Rumors. SOny has had patents on this crap from well before the PS3 came out, but they never utilized them because consumers would lash back.
2) Gamestop stock took a hit when investors finally realized what this means for the future of the gaming second hand market. They will not hold back in defending themselves.
3) You buy computer games. They get patches, DLC, and have to be installed. You can use a computer to browse the internet, and get actual work done. Once consoles incorporate PC DRM, they are killing themselves. They already require painful load times, lower level DRM, and only perform one task. The only benefit will be the cost of a console versus that of a PC.
4) Valve boned the Nintendo x Sony x MS relationship with Steam. Once cheap games, with the DRM that publishers want, became available 24-7-365 over the internet consoles were rather outmoded. Combine this with Valve's aggressive pricing, and the fact that consoles attempts at online entry have been poor at best, and you've got a disaster for console companies.
5) Even if the other four points are disregarded, what is the motivation for MS? They license out game development, so killing used games will hurt their bottom line. No used games will translate to poorer sales, because people will never buy at full price. A $60 game is reasonable if you can resell it for $20 after playing, but not if it's worth nothing. None of this even scratches the lending of games, and need for online authentication. ME tried for 100% online, Assasin's Creed tried it, Anno 20 (I can't even care about the title to look it up) tried it. They all either changed scope, or sales figures sucked due to this practice.
Bring on the next console wars. I'm looking forward to PC versus Nintendo, because Valve looks like a champion compared to the twice baked turd of DRM heavy consoles.