There are a variety of services like Tor2Web that make accessing .onion sites on the plain internet trivial. For MOST .onion sites you may well not want to do this, but when all you want to do is hide the identity of the publisher, rather than worry about the privacy of the visitor, it's not really an impediment.
There is the matter of bandwidth -- this is where being pulled into other repositories and copied would be helpful. The code is small, but tor is notoriously slow.
