Phantom Pain, Tomb Raider, and Call of Duty were all running on Xbox 360's. Those games are 3 months old, and the PS4 is 10x more powerful than the 360.
So they go from making games for Xbox 360 for 10 years, and now all of a sudden, out of nowhere, for no apparent reason, before the system has even been maxed out, we need a new console?
Which shows something... The flexibility and scability of tools will be very important in the near future.