X1 will never catch or match PS4 sales, it is a misfired product.

[DélioPT]

This one time, in last generation, PS3 was dead last...

Things change. If there`s one thing that videogame history shows is that nothing is written in stone.
Personally, i believe that when this generation ends XB1 will just have reached 60M. A big fall, but still very good.