Xbox One is going to be advertised and promoted to hundreds of millions of people this year, every time they turn their PC on

[thismeintiel]

chapset said:
I don't think the lack of advertisement is the X1's problem

This.  Of course, it won't have a negative impact, either.  It'll just kinda be there.  PC gamers will most likely just continue to use Steam, with the occasional jumping over to XBL if there is an exclusive on it.