I was also curious about Namis dream getting 100% fulfilled after we learned about the rising sea levels already swallowing existing islands etc.
Even in random cover stories, we saw various places the straw hats never went to. Or underwater cities / ruins. If the sea levels sink again and these monuments see the light of the day again? Won't she have to travel the World again? Or the other routes full of islands the other Worst Generation Members took to travel to sabaody.
Not to mention the final war that will definitely shape / deform / completely destroy islands and landscapes as well.
Maybe Oda will show us Nami traveling the World with Nojiko and Gen-San in the Epilogue at the End, drawing these new places then.
I don't know, her dream is really hard to show on-panel, while so much is going on in the final saga. (But not impossible)