You haven't paid attention lately then. Graphics cards and SSDs are the few computer components where lots of innovation still happen and where there still is need for, and room for, improvements. They have long been held back by the 1920x1080@60Hz plateau of affordable display panels and the bandwidth limits of HDMI/DVI/DP interfaces but now with the 4K panel boom, FreeSync/G-Sync and DisplayPort 1.3, things are moving again because now once again the graphics card has become the bottleneck. Not even tripple SLI of the very expensive Titan X is enough to run the latest AAA games at 3840x2160@120Hz with all settings at max. You are correct that the past half decade has been fairly boring in this area though, even though some great things have been brewing during this time (G/FreeSync, Mantle/Vulcan, HBM, etc).