Its not uncommon for new consoles to sell worse than the previous gen initially. 360, PS3, 3DS, Vita, Wii U all have had this fate, will PS4/One follow in there footsteps?
PS360 are about half the price, have huge existing libraries and will continue to get majority of 3rd party support. I can see alot of current PS360 owners being content with there current console for another year or two and late adopters will continue to purchase these older consoles. That pretty much leaves the most hardcore group of gamers as PS4/One customers. These consoles cost $400-500 and when u factor in a game, online and extra controller, ur looking at closer to $550-700 which is a huge alot of money for gaming.
I imagine PS360 will outsell them in the earlier parts of the year but PS4/One will have a strong comeback over the holidays. I could see it going either way personally.
PS3/PS4 8-10m each
360/One 6-8m each
When the herd loses its way, the shepard must kill the bull that leads them astray.