I agree a bit with Paul, in that if a new "standard" cord type was adopted having enough conductors to satisfy all brands flash protocols would make sense.
Also, even though Canon uses 6 wires and many high end users on WP don't seem to want to learn how to use eTTL2 (or Nikon's iTTL either) to the effectiveness it is used all the time above water, this would certainly make it easier for newer dSLR shooters to get results they're happy with....Ikelite TTL houing users (with Ikelite's DS series strobes, of course) can be shown how to use the eTTL2 / iTTL in a matter of minutes and be getting good exposures. Even with moving critters!
Finally, I went back and looked, and I see about 50 /50 Nikon to Canon dSLR shooters on my trips and housing sales last year. So this may be just particular to countries or regions. I thought in sheer world wide volume Nikon still hasn't caught Canon in shipping dSLR units of all models, but I could be wrong (????)
But for usability it still comes down to the chef, not the pot ![]()
YMMV
dhaas