In the long run we are all dead. So a “death sentence” far enough out is meaningless. Riscv killing arm is pretty distant.
They will all be replaced sooner or later.
I have no particular affinity for arm or riscv. Playing fan-boi for any technology is silly.
At least, I did not choose the side of an ISA with global super strong IP locks like some...
There are much more toxic fan boys than some other fan boys...