You might be on to something...
Its funny, there is sort of a semi-pattern when it comes to predicting or knowing the next arcs. Not fool proof mind you, but you can see how some examples potentially reveal those things:
- Fishman Island established Luffy's beef with BM
- Punk Hazard was a clear indication that a Doflamingo and Kaido centric arcs were coming. We also knew about "Zou" at this point.
- Dressrosa started the missing Sanji plotline with half the crew leaving DR, leading us to WCI.
- Now constant Vegapunk teases in WCI and Wano and seemingly an order of Supernova focus technically supported Egghead as being the next arc (we just didn't know the island name) since Bonney has been trying to go after Vegapunk since Marineford (but was caught by BB).
- And even NOW, we've been getting signficant focus on Cross Guild and Blackbeard, both of which are leading pirate groups for silver medalists and Underworld groups. Blackbeard has now taken Koby, who's allegedly back at Fullalead. Drake is still missing (presumably saving Hawkins' life), which I assume will play a role in this scenario.
Even with Wano passing, we STILL don't know what Drake was trying to do as a sword member. My ultimate guess is this really has to do with Aokiji infiltrating Blackbeard's crew, and he was doing the same with Kaido.
So I say just like Vegapunk, there is SO much potential for a Fullalead arc after this, especially since the first chapter of this arc is already seemingly connecting Egghead to Fullalead in small ways.