Luffy will become a fullfledged great pirate aka yonko aka the level Shanks was expecting him to be in order to give him back his hat. Kidd at best can become a pseudo yonko aka Luffy current status and that imo is right since of course Luffy will be the main contender while people like Law and Kidd will just be side characters compared to Luffy. If it is a vs Doffy fight again they could even be used just to hype Kaido and BM like what already happened with Law.
When Luffy will get the OP at that point he most likely will have already fought BB or that will be the very next fight to happen after Luffy discovers it so Kidd by that point will be highly irrelevant, if Luffy hasn't already left him in the dust like for Law by EoS the gap will already be relevant and anyway Kidd for sure is not EoS stuff, probably this arc will be his most relevant point in the whole manga. He will have other apparances like post eos if he will still be alive or in a supposed big war at the end of the manga but he will have this arc and not other ones like Law. Now are his 15 minutes of celebrity.
Maybe Kidd will try the standard emperor route and take territories, that would be fine since Oda can simply put that as side infos when the SH are reading the newspaper or something. About Luffy I don't see him all of a sudden starting to manage territories, he will be the backer of the country and that is that, it is the same that happened for Fishman island: Poseidon and co will keep to rule it woth even more freedom than before (no candies for BM to dispatch), same for Wano with Momo.
What I see Oda doing with him after Wano? He will be put again in the background but not to the point to be buried in it like characters like Gin or Vergo who only exist in sone threads in this forum nowadays. Maybe he will get the same as Croco and Lucci, very rarely there will be some very small upgrades about them (shown for a moment between the arcs like it always happen) and where he is and what he is doing. Maybe, if he is quite lucky, he will get some special status like Law and get some light in the interludes between each arc to show that even if they are not Luffy real matches they are improving to the point they will become the next emperors (Kaido and BM replacements).
When Luffy will get the OP at that point he most likely will have already fought BB or that will be the very next fight to happen after Luffy discovers it so Kidd by that point will be highly irrelevant, if Luffy hasn't already left him in the dust like for Law by EoS the gap will already be relevant and anyway Kidd for sure is not EoS stuff, probably this arc will be his most relevant point in the whole manga. He will have other apparances like post eos if he will still be alive or in a supposed big war at the end of the manga but he will have this arc and not other ones like Law. Now are his 15 minutes of celebrity.
Maybe Kidd will try the standard emperor route and take territories, that would be fine since Oda can simply put that as side infos when the SH are reading the newspaper or something. About Luffy I don't see him all of a sudden starting to manage territories, he will be the backer of the country and that is that, it is the same that happened for Fishman island: Poseidon and co will keep to rule it woth even more freedom than before (no candies for BM to dispatch), same for Wano with Momo.
What I see Oda doing with him after Wano? He will be put again in the background but not to the point to be buried in it like characters like Gin or Vergo who only exist in sone threads in this forum nowadays. Maybe he will get the same as Croco and Lucci, very rarely there will be some very small upgrades about them (shown for a moment between the arcs like it always happen) and where he is and what he is doing. Maybe, if he is quite lucky, he will get some special status like Law and get some light in the interludes between each arc to show that even if they are not Luffy real matches they are improving to the point they will become the next emperors (Kaido and BM replacements).