A mixture of it becoming much more expensive to produce large high-density panels with an acceptable number of defects and the disproportionate increase in band

A mixture of it becoming much more expensive to produce large high-density panels with an acceptable number of defects and the disproportionate increase in bandwidth and memory required to handle larger screens. Single-link DVI only supports a resolution of 1920x1200. HDMI didn't go above 2560x1600 until a couple of years ago. Displayport's still in that ballpark.