I dont know if i should laugh at the current developments or not. I mean, a lot of people would be happy to have Nezuko take over considering she was mostly in a box for a great lenght of the series, but also what If Tanjiro does exactly that and becomes a demon despite Muzan being like "nah he wont transform he will just die". I mean when was a villian stating something like that about a mc right? Tanjiro probably has a thicker plot armor than Inosuke, and that's saying something considering what happened at the red light district.