Beast Pirates will be a non-factor after Wano; the Calamities are going down, the non-Supernova All-Stars/Flying Six aren’t likely to be strong enough to stick around, and from what we’ve seen, the rest of the crew is only slightly better than fodder. Without Kaido to lead them, there’s nothing more we need to see of those guys.
BMP are gonna end up allied with the Straw Hats, if Katakuri’s reaction to being defeated by Luffy is any indication. Linlin herself probably won’t be their friend, but all the kids will rally behind the one man who’s left a substantial dent in her reputation.
I don’t understand the prevailing mentality in the OP fandom that Shanks and his crew are destined to be massacred. Oda has mentioned in the past that the Red Haired man is the character he most closely identifies with, and as a writer myself, I can tell you that authors rarely kill off people like that. He plays too big a role in Luffy’s development to not guide him towards becoming PK in the near future, and his crew has only been explored on the surface. We’ve seen some curveballs in this series, but I’m confident that Shanks and those who sail with him will remain unharmed.
Blackbeard is a wild card, which isn’t breaking any new ground. Will he be the final villain in Luffy’s voyage? Will they end up killing each other? Will they team up to take down the Marines? The parallels between his crew and the SHP are myriad and obvious, but other than the fact that he’s likely the last Yonko to go down, I’m still not entirely sure what to expect with Teach.
Bonus: If - IF - there is a new class of Yonko to arise from the current Worst Generation after our protagonist becomes PK, I see it shaking out like this:
Law (assuming HE doesn’t die in Wano)
Kid
Urouge
Either Bonney or Hawkins
