I might be too young, but I never knew KFC as Kentucky Fried Chicken, it's always been KFC, or around here people tend to just called it 'The Colonel'. But I understand what you're saying. Its like all of the TV channels that have moved from their original format and have moved to being known by their initials. AMC, TLC, MTV, etc.
On a side note, the whole patent and trademark system is screwed up. Back in 2007, I wish Cisco Systems would have had some balls and challenged the biggest bully on the planet, Apple, for the trademark for 'iPhone'. Can you imagine the hissy fit ole' Jobs would have had if he couldn't use the name 'iPhone'. I can't believe Cisco, a company that could go toe to toe with Apple conceded.