Hes just talking about porting games. Both systems will have strengths and weaknesses so making up for those will be a problem while going PS3>XBOX or vice versa.
Its funny that hes the one commenting on this since he made one of the most graphically unimpressive and unimportant games of the last gen:Guitar Hero.
Getting an XBOX One for me is like being in a bad relationship but staying together because we have kids. XBone we have 20000+ achievement points, 2+ years of XBL Gold and 20000+ MS points. I think its best we stay together if only for the MS points.
Nintendo Treehouse is what happens when a publisher is confident and proud of its games and doesn't need to show CGI lies for five minutes.
-Jim Sterling