A good package management system is a very important part of a Linux distro. What's much harder to achieve is a large and well maintained collection of up to date packages. You can have the best tools in the world but if they aren't backed up by well maintained packages then those tools are pretty use less.

This is why Debian has dominated Linux distros for decades. Debian's apt-get is a good package management system. Not perfect, not the best, but good. But, no one can compete with Debian for quality and quantity of well maintained packages.

Only time will tell if any of these next-gen package managers will succeed.