I agree with this. Piccolo's relationship with Gohan would make him lose interest in world domination as well. Just keep Goku, Vegeta, and Krillin dead and revive Yamcha, Tenshinhan, and Chaozu, and it would be a perfect ending.
GT, only because we would be spared of everything that came after it.
Evolution is not part of the franchise obviously, but that movie made Toriyama write Battle Of Gods, and Evolution is one of the worst movies ever made in general, so that needs to go as well.