I think the new world has so much potential in terms of story. People seem impatient with the progression of the story at times. Lets savor the greatest sea on the grand line while it lasts.
If Oda asked for ideas from his fans regarding Islands and Arcs, what would you suggest to him?
The new world was what people called the western hemisphere in the 16th century i.e. the americas. We have seen islands up until now but what about continents? What if there was a continent that resembles the wild west period of the United States? Of course, this continent would be lawless and home to outlaws, pirates, and most of all, bounty hunters. This could be a great opportunity to expand on the bounty hunters in the one piece universe and actually have formidable and menacing bounty hunters.
I have always thought Vegapunk was from the future, which would explain his ability to produce technology that was several centuries ahead of its time. Which leads to the idea of a time travel arc. Yes, it seems cliche but I think Oda could make it work. Maybe the time machine Vegapunk came in explodes and sends the crew into Vegapunks native time. They could be sent to the time of the pirate kings reign or maybe even the void century. They could all be sent to different times, which could add to their individual character development.