That particular Xkcd comic has been posted 79 times in the past year or so† and has quickly become a cliché. The authors' stated goals are to make a "purely functional" and "practical 100% free" package manager.†† They don't mention competition, proliferation, or winning market share. A vague hope of consistency and cohesion accompanying the announcement of a program "approaching its first alpha release" isn't a rallying cry. I think they made this announcement simply so that people interested in this sort of thing might take a look.
Unfortunately, I could only process the first 1000 entire list of ~1500 results because the API refused queries with start > 900. I have sort of a bad conscience because I'm polluting future queries by posting the top 10 list above, but I think I can live with it.
† http://www.hnsearch.com/search#request/all&q=http%3A%2F%...
†† http://git.savannah.gnu.org/cgit/guix.git/tree/ROADMAP