So, I recently gave up Lycanthropy (before hearing of Dawnguard's adding of a werewolf Skill Tree), and i'm kinda holding on to this idea as a last ray of hope,
Unknown, what is known is when you become a vampire lord you're cured of lycanthropy and in this case you are given the option to become a werewolf again. But that doesn't mean there is an option for those cured the normal way.
but, does anyone find it odd that Aela the Huntress cannot be cured of being a werewolf
No she likes being a werewolf, she even has the totems of hicrine quests thats why she can't be cured she thinks the beast blood is a blessing.