Isn't a one second delay a bit overblown? If your anticipating shooting something you probably have the camera on already and hanging on our neck or something?
I don't recall having a one second delay to have done anything to my photography needs. The canon 7d is even faster to bootup but I have never needed it that much through over 100 000 photos. Maybe once or twice but those photos came out s*%tty anyway.
It seems only on the 5D3 has the bootflag not been disabled. Start time has jumped from 0.2s to 2s. That includes time to wakeup from sleep mode. Lots of photographers put their camera into sleep mode to conserve battery power.