Looking at https://dumps.wikimedia.org/enwiki/20170101/ currently, I see:
2017-01-02 21:16:30 done Articles, templates, media/file descriptions, and primary meta-pages, in multiple bz2 streams, 100 pages per stream enwiki-20170101-pages-articles-multistream.xml.bz2 13.5 GB
I personally always avoid this dump because it's so infuriatingly ambiguous about what it does and does not include. Does "templates" include Scribunto/Lua modules? Does "primary meta-pages" include pages such as customized MediaWiki messages?
Instead of dividing seemingly arbitrarily, we should instead divide by page.page_namespace. For people interacting with the dumps, I think such a technical division would be quite useful. I somewhat regularly get asked to do dump scans of just a particular namespace. Even if the requests were for multiple namespaces, I could pick and choose what I need and don't need more easily.
For all namespaces, we have "meta-current" of course. This is sufficient.
This task is vaguely related to T20919: Provide database dumps of just article namespace and/or remove project-space from "articles" dump.
It may make sense to do away with the "pages-articles" dump altogether, but it's unclear how much of a breaking change that would be. We could just leave it alone for now, but that would take up more disk space.