Do you think PS4 sales will ever be double that of Xbox One?

[S.T.A.G.E.]

ICStats said:
There's a good chance they will between their Japan launch, and the release of Titanfail.

I would implore you not to underestimate Titanfall. That game will sell very, very well. Its future iterations wont be exclusive to the Xbox if it sells well so it will be fine.