Torres,
Have heard that line just recently...
I was fortunate enough to be at Omaka over Easter where an RAAF Caribou was displaying.
The commentators used that line ".. the only aircraft to replace a Caribou is another Caribou". FWIW there was also discussion that there is more than just a possibility that the 'Bou basic design may go back into production, but with updated (presumably turboprop) powerplants.
Having seen the 'Bou's STOL performance and heard the stories of its operational performance in some pretty tight spots, I can easily believe the commentators were right:
".. the only aircraft to replace a Caribou is another Caribou".