They all could make it! They all survived at the Final Battle agaisnt Muzan.. and they could kill him! It's a huge victory.. and the Demon's Era is Over! Or that's what they thinked...

The Hashiras were at the Butterfly State.. healing and recovering.. they all had huge bandages around their bodies.. but they all were Alive...

Uzui was the unique one that didn't go to the Final Battle.. and Rengoku survived to the Mugen Train.