You know... maybe I'll just stop watching Vtubers, because I'm sick & tired of feeling this way.
It's okay. You must prioritise your own health and feelings, so don't be depressed too much and choose your own borderlines and interests. Actually, I've dropped Hololive by myself after Sana's graduation (and too many others before that)... And one important thing - try not to think of it as a great sorrow, I don't think anyone of vtubers would like to see their own funerals, unless it's Ghanaian funerals.
Nobody forces you to watch them. Honestly this issue becomes more and more common as the concept become known outside of Japan.
I'm sorry, is it unreasonable to be sad that someone you like will be going away (most likely permanently) & having their history wiped with the exception of a few clips?