The answer to "is there a replacement aircraft for the DC3?", is Joe McBryan doesn't give a sh*t, he doesn't want to replace them. He hates jets and it has taken years and years for his son an friends to even convince him to look at turboprops. Even then, they go out and buy what are considered old equipment like the Electra.
Buffalo Joe simply doesn't think jets are real airplanes. He still flies hiw own Norduyn Norseman built in the 30's for fun.