However, HDMI (which is primarily four pairs of high speed serial--just like Ethernet) and later Displayport became the "solution" because of all the people pushing HDCP.

Thunderbolt was the "solution" to the fact that USB 3.0 wasn't coming down the pipe fast enough. And that drivers were just too complicated. Why solve the simple problem of loading a driver at boot time when you can just give the peripheral complete control over a system bus? What could possibly go wrong?

USB 3.0 is an "evolution" over 2.0 in the way that a jackalope is an evolution--splicing two completely unrelated things together (USB 2.0 spliced with 4 high speed pairs--just like Ethernet). But you can't charge a licensing fee for Ethernet ...