His name will live on in infamy because of his exploits done as a member of the Pirate King's crew. Whether or not people mention him as the World's Strongest Swordsman 200 years down the line, it will be in tandem of being the Right hand man of the Pirate King.
People aren't going to stop in front of a Zoro statue and the conversation will go like....
Persona 1: Whose that?
Person 2: Roronoa Zoro, The World's Strongest Swordsman of over 200 years ago.
Person 1: Oh cool, what did he do to get that title?
Person 2: He beat Dracule Mihawk.
Person 1: Cool, cool, what did he do to get that title?
Person 2: