Oda cares about what happens to the SHs at the end of series and beyond. He's invested so much into these characters he's going to give the SHs closure and a good epilogue.
It's more possible that Zoro will live Mihawk's style of life rather than sitting on Wano babysitting retarded Samurais.
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One things for curtain Namis Doors will be open past her prime.