I still think that for mobile devices multiplexing DisplayPort, or some video signal, in parallel with PCIe (as Thunderbolt does) makes more sense than PCIe only. With only PCIe, a GPU will be required at the monitor end.
PCI and the PCI SIG have again done outstanding work. PCI continues to innovate, Congrats... long ago (1990). I fondly remember debating 5V or 3.3V as the first spec. (PCI 1.0), We have come a long way and revolutionized a industry.