I would be so dissapointed if that happens.We are already too far away in the One Piece story-wise for Luffy to be able to just hit Katakuri's pride.
It's time for him to able to defeat High-end pirates,if not Yonko themselves .I mean,wasn't the time skip meant exactly for that ? If that's not the case then we should expect another one before Luffy goes after Kaido.
I'm actually with you on this one. I want Luffy to develop in this fight and pull a victory out of the bag. To defeat an undefeated opponent would be quite the statement. But if a Yonkou's right hand man goes down now then Big Mom's arc is over for good there a no coming back to her in Elbaf the hype will be dead. Luffy said it numerous times AFTER he defeats Kaido he will come back and deal with her. What's the point of that if her second in command is already defeated. That's why I feel like there's going be a rematch later but of course I want to see Luffy power up and defeat him in a fun and creative way maybe if not through brute force.