Yes but certainly not to the same extent as Wii U, more likely they will sell similar to 360 and PS3 first full years. 360 did just under 7m in 2006 and PS3 did just under 8m in 2007. There are a few reason why I see this happening.
PS4 vs PS3 Pros/Cons
Cheaper than PS3/doesnt have a new format
Better line up/shares most games with up to 5 platforms
Better online/costs $50 per year
One vs 360 Pros/Cons
Xbox brand has grown/more competition (360 only had to face PS2, One has PS3/360/PS4/WiiU)
Better lineup/shares most games with up to 5 platforms
Kinect is impressive/makes it most expensive console
Overall I see One selling about 6-7m and PS4 about 8-10m in 2014. Based off how much PS360 have declined in the past 2 years, id say 360 will sell 5-6m and PS3 will sell 7-8m next year so next gen consoles will sell slightly better than predecessors, mostly due to as stronger holiday 2014.
When the herd loses its way, the shepard must kill the bull that leads them astray.
