I'm guessing Zoro's eye has some demonic Asura powers? Or maybe Mihawk got his Hawk-eyes with training and they grant him some sort of ultra-refined vision beyond regular observation haki...that ability of Zoro would
conveniently come in handy now that Shillew has Absalom's Suke Suke no Mi? As for Luffy, I think once he starts to properly chart his way towards Pirate King status after this arc, there's no need for Yonko, really — we might have two broad groups divided between Luffy and Kurohige with Shanks as some sort of third wheel — or did Roger have Yonko below him (like Shirohige/Shiki), hmm. And I too want/need more Dragon in my life — we hardly know anything about him and bringing down the CP0 would finally be a statement of intent from someone who's supposedly the
Most Dangerous Man in the World but hasn't done much in the current storyline wrt. massive-scale disruption to deserve the billing. As for the poneglyphs, the stuff inscribed on them is the key that unlock all the grandest mysteries isn't it? The Void century, Will of D, Joy Boy...all of it will probably get resolved at the same time. Also, considering Robin is the only person capable of reading them, I wonder how and when she'll be targeted by others. Could Blackbeard use Catarina Devon as a decoy, now that she has the Inu Inu no Mi model nine-tailed fox? Another thing I'm looking forward to is Franky building the counter to Pluton. Also the Vegapunk reveal. And oh, Luffy's mom! So many things that need resolving, and yeah it's a bit slow right now, kinda why I usually prefer to go on a One Piece hiatus and then read 5-6 months' worth of chapters in one go...