Don't forget RoTR comes out on 360 as well, and it may sell quite well there. Indeed for franchise fans who what to buy PS4 for their 8th gen machine buying a cheap / used 360 to play RoTR seems like quite a viable option. If I was desperate to play RoTR this year buying a 360 would be exactly what I would be looking to do.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix