That was a Bro speech there. "WHY!? You weren't suppose to be here. You were suppose to get married, have kids, be a geezer. Instead, your here, bleeding on the ground. Stupid bro!"
I don't think anyone from the tanjirou's generation will die. Well, with genya cut up I think this means all of them are out of the battle for now anyways so until they face off against muzan they should be fine. I just hope nezuko remains safe and isn't sacrificed somehow by the end of this series. I was devastated when I thought she was gonna die from sunlight back at the blacksmith village.
I think the main worry now outside of UM1 battle is where is upper moon 5's replacement? 6 and 4 were replaced but UM 5's replacement has yet to be revealed right? He/she is going to probably throw quite a curveball into the coming battle.
If Nezuko actually does die I'd be heartbroken. You bring up a good point with UM5 still lurking around. Maybe UM5 is with Muzan atm incase anyone gets close to him?