Sony will probably be in the TV making buisness for quite a while yet, which will unfortunately give Sony the neccessary funding for the creation of a PS4.
This is probably what happended during the time that the PS3 was made.
Boss - Alright designers, make me a sequel to the great PS2 while you only have a pay of 40 yen worth per hour.
And thus the design team did a crap job.
Note : 40 yen is about 20 pence or 33 cent.
Note 2 : Why does your avatar always give us the middle finger? I'm warning you, as I'll program

to come after you (jk)