If this petition etc works I'll be very impressed, but can't help feel if they are approving a Sainsburys local, (i seem to recall a thread mentioned that, I may be wrong), then I think there won't be hard for another high street name to arrive.
I also think there would be a different story if it was Firezza that was opening with it's more classy appeal.
Lastly, if you have been to the uber gentrified yummy mummy oasis that is Crouch End you will see their lovely large old bank building is a KFC.