Absolutely. That is definitely the plan. The stylesheet factory is only a factory for people creating the themes, not consuming them. We just don't have a distribution yet.
I was chatting w/ Joe Ottinger in IRC today about distributing themes and how Asciidoctor might consume them. Something we should solve for 0.1.4 (or at least 0.1.5).
The proposal we came up with is to get rid of -a copycss and replace it with:
-a assets=copy
-a assets=embed
Then we can also set the theme, which would grab the assets from a distributed gem and pull them either into the document or the output directory. wdyt?
The hard work in this task is setting up all the infrastructure for this (git repos and gems).
-Dan