alt Hacker NewsMultiple package managers is fine, what's needed is a common repository standard (or even any repository functionality at all). Look at how it works in Java land, where if you don't want to use Maven you can use Gradle or Bazel or what have you, or if you hate yourself you can use Ant+Ivy, but all of them share the same concept of what a dependency is and can use the same repositories.
Also, having one standard packaging format and registry doesn't preclude having alternatives for special use cases.
There should be a happy path for the majority of C++ use cases so that I can make a package, publish it and consume other people's packages. Anyone who wants to leave that happy path can do so freely at their own risk.
The important thing is to get one system blessed as The C++ Package Format by the standard to avoid xkcd 927 issues.