Some are saying Nvidia are not going to be the GPU provider for the next gen Xbox and PS consoles, hence their emphasis on the PC market and attempts to make themselves synonymous with PC gaming for promotional purposes.
Also, the PC gaming market consists of free 2 play, micro-transactions as well as ad supported models (Deus Ex snigger) - gaming revenue might be growing but it doesn't mean you need a super fast badass graphics card.
Plus, the current fastest GPU (GFX 590 or whatever) might be 10x faster than whatever's driving the Xbox 360 and PS3 at some things but it's definitely not 10x more capable all round or importantly offers 10x better graphics. Consoles don't have to run a bloated operating system in the background so put far more into raw gaming percentage wise.
So, those figures are to be taken with a hefty pinch of salt as some sites
say. Having more levity in appraising the gaming market more comprehensively and fairly would be better than one dimensional arguments as put about by Nvidia's PR firm. I'm all for PC gaming growing in market share but appreciate PC gaming (including laptops) isn't all about triple A star titles with incredible graphics all the time. If anything things are moving away from this. I'd like to see a better analysis to be honest.