Replacing questionable meat with hype pseudo-meat is a straight win all around. I'm as carnivore as they come, but if I have to hit a Burger King, I'm just going to get an impossible whooper: if i'm going to be getting a shitty burger either way, I'll take the one that didn't require all the logistics around cows.
This KFC one is just the next step. Replace all the questionable meat with pseudo-meat that is (hopefully) more sustainable, and leave the "real" stuff in caviar territory where people actually care.