With that said, i agree that no one "cares" about Discord. If a better thing comes along i could easily see people dumping it. But, i imagine it'll be a bit more difficult. Discord "won" in my view because it simply had to be modern to be vastly superior. However, i'm unsure how easy someone can make a next version that is such a superior leap.
Fwiw, as a gaming voip/chat i still find it a pretty great UX. My only complaint is that it is a bit laggy due to the, i assume, web-based interface on "desktop".