To answer this seriously, HDMI needs gigabit networking, not just what they currently have (100mbit).
The reason for this is that HD content streaming requirements over the network can exceed the speed of "regular" (100mbit/sec) ethernet.
Or in other words, HDMI 1.5 needs to support sending 1080p over the network -the current speed of ethernet in HDMI 1.4 cannot.
The bandwidth of Blu-ray is half of the bandwidth of 100 mbit Ethernet so you do not need Gigabit Ethernet to transmit that. Supporting Gigabit Ethernet would require more wire (as spec'ed today) making the cable even thicker. So while I appreciate your sentiments, I don't think it will be a step forward .
I think we should move away completely from these synchronous, uncompressed links to smart interfaces that send *data* to be decoded and decrypted by the target. We take a 20 mbit/sec compressed video and explode it into hundreds of megabits/sec and then wonder why we have connectivity issues across a cable. The whole thing is broken and they keep making it worse by turning its speed higher and higher.