I guess Sony and Microsoft should have just given up straight away last generation when the Wii pounded them in to the ground? Glad they didn't or maybe Sony should have when it was consistently being outsold by the 360? Again, Sony proved that with time it's possible to turn things around and they are now in the position you see right now with the PS4.
Writing Microsoft off already is just bonkers. they have plenty of years left in their current machine. In the same instance you could be asking Sony to pack up and give us more powerful hardware right now too as other than the DDR5 the rest is easily bettered by current PC's.
Xbone won't see a similar turnaround.
Second place still makes multi-millions of dollars. And an early lead by Sony does not make an entire generation of titles to come mute from any other console maker.
The console sector isn't exactly a huge money maker, that's why there are so few players in this market.