Declingn PC amrket... well a bit maybe, but it is a "non necesary" item now, when so many people lost their jobs. Also if we factor that since 2007 (crysis 1) we only had 1 DirectX improvement that is not even fully utilized, its hard to keep the PC market alive.
When Unreal Engine 4 comes out, there might be a new move towards PC comsumption, but till then, who is going to buy a new PC for games that their 5 year old PC can still perfectly play? (my PC is 5 years old, just upgraded the GPU).
Well, id like to upgrade my PC, i really do, but there is simply no reason at all for me to do it (and im still rocking DDR2 over here).