I see that there have been multiple posts about Evernote and Markdown, some fairly long, but not much in the way of actual movement in that direction by the Evernote team. I totally understand the concern that most people don't know what markdown is (valid) and probably don't want to learn (maybe..it's pretty easy AND useful), not to mention the underlying changes it would require in Evernote's back-end, compatibility with existing notes, etc.
A long time Evernote user (#169,158 according to them, and Pro for nearly all of it) I've always felt that the one thing Evernote did worst of all,