well if Madden still obtains the rights to NFL, then that is a huge blow to PS3 and 360. But Sony already has alot of first party sports franchises. I know they have basketball and baseball 1st party.
Microsoft relies much more heavily on third parties and therefor on EA.
If EA did enter the console market (even though this makes no financial sense), then both Sony and Microsoft would have to scramble to fill the void in sports franchises.
Golf, Hockey, College Football, Pro Football, Boxing
But Microsoft would have a higher hill to climb.
Oh apparantly all of the sports franchises have contracts that they must release on all consoles, well that makes things boring doesnt it