This is likely, but only because most Yonko members don't go all out at the gate.
Thing is that's a really good setup.
King: Ultimate defense. Just let him tank all the heavy hits and you'll be fine. He also has some nice AP.
Katakuri: Admittedly, he got power cliffed, but he can serve as a lookout and tell you what's coming next. He can also be a distraction with his Mochi powers and maybe try to like, trap the Yonko in it for a second.
Sabo: Can tank and repel any flame attacks, as Logias are immune to their respective properties. If they fought Big Mom, Sabo and Marco can take out Prometheus and leave her with just 2 Homies.
Marco: Overall a great pick. Has flight, good AP, and could restrain Zoan King and Queen by their necks with his wings. His Haki is very good, and his fruit is marvelous for support and defense.
I see it like this:
Big Mom: Quite hard, as she's tanky and has a lot of endurance plus strength and Haki. I might switch Katakuri for Zoro or Shiryu here, as they're both quite skilled sword users and Zoro can cut flames and has arguably Top Tier AP if he uses Asura with ACoC now. Shiryu's invisibility can also allow him to sneak attack or even try to go in BM's body and clap her organs while she's unaware.
Overall they could win but they have to hope BM doesn't use Advanced Haki + Life Amps or they're done for.
Kaidou: I might also switch Katakuri for another YC1 like Zoro here, because Kaidou can just speed blitz and Katakuri has a glass jaw so one good Thunder Bagua puts him to sleep for a good while. Also, Kaidou is gonna be a problem because while Sabo and Zoro can negate things like Bolo Breath and Kaifu, he still has devastating club strikes, nutty durability, nutty endurance, etc.
Kaidou will be the hardest to take down for them, and I don't believe they could pull it off in the end game, at least not yet.
Blackbeard: Easiest one, because he has a tendency of tanking attacks and sword users who don't over rely on DFs are the bane of his existence because he focuses on trying to null DFs.
Sickbeard: Assuming they can put him down in time, they should win this handily due to Sickbeard being a tad slow and King should be able to tank his attacks though they're dura neg.
Shanks: Don't know, tbh.