Could we organize all Emacs packages with a single repo system?

[Andrew Pennebaker <apennebaker@42six.com>]

Marmalade and MELPA are really cool. I'd love to see their packages merged
into a single system (Marmalade or MELPA, doesn't matter), to reduce
confusion.

There are some cool packages only in Marmalade, and some nifty packages
only in MELPA, so I have to instruct Emacs to check *both* repos in my
.emacs :P Yuck.

If the repos hold different versions, you could get nasty dependency
conflicts.

And we could finally build in support for the repo into Emacs, so users
don't have to manually insert the default repo into .emacs. I think M-x
install-package xyz should work out of the box, zero configuration required.

Of course, configuration would still be available, should further repos
spring up, and users want to prioritize them over the default one.

Personally, I'd prefer MELPA for its distributed, git-based approach. But
it's more important to me that Emacs get a standard package management
system akin to RubyGems, that runs out of the box with no configuration
required, to make things easier.