What's different about this time compared to every other time is that Zoro still has unfinished business/plots in Wano, and if you don't believe that he does, I honestly don't know what to tell you.
If Hyogoro's comment about Luffy being like a "guardian deity" or whatever he said and Who's Who's comment about the Gomu Gomu no Mi received immediate payoff, I don't see how the same Hyogoro (and Kawamatsu) noticing Zoro's resemblance to Ryuma/Ushimaru and commenting on Zoro's "fate" being tied to Wano won't receive a similar payoff
In fact, we've been teased on black blades since act 1 or act 2 and we haven't gotten any development on that yet.
You'd have to think that Zoro will be dying/unconscious for all of this lore that pertains to him, and I can't see that being the case. Besides, there should be hardly any time left for Zoro to be out of commission for another arc. The end of Wano will likely trigger a worldwide chaos that puts the Straw Hats at the center of everything, I doubt there will be much downtime for the Straw Hats