I think people will stick to brand. If you have an Xbox360, you will probably go with the XB1. If you had a PS/PS2/PS3, you will probably go PS4.
I'm going Sony because their exclusive games are some of my favorites (InFamous, Uncharted) and Sony will have Hulu and Amazon Prime and Netflix and sports packages. I dont think if you pick one or the other you are going to miss out on a "total entertainment" system.