+1
I don't think a graphical user interface is what is important now. If you look at other package management systems, APT or RubyGems, they work very well just from the command line. With GoferProjectLoader we basically have this command line interface.
What is much more important is a process. We need universes for the different Pharo versions and for the different maturity/compatibility states of packages (e.g., unstable, testing, and stable). We need somebody who sets up a process and keeps it running, and we also need package maintainers.
We can list packages on a website (like packages.debian.org). This should make it possible for anybody to find the desired package and install it.
Of course, a GUI would be nice to have. But without a high-quality package repository, it will be only of little use.
I don't have much time left at the moment, but I can assist somebody who wants to get such a system up and running. I believe its going to be a very important step for Pharo.