Not throwing things away. X86 will continue to exist for sure. It’s just if ARM is popular to developers, the barrier that sometimes your code don’t run on ARM will eventually be removed. After the barrier is removed, some advantages of ARM will shine, such as more energy efficient, more cores(so when you buy a cloud server you are more likely to have dedicated cores, instead of vcores).
Law doesn't work like this.
This is not law, this is impersonating God, or a bad prompt to LLM I guess.