Ha! I was planning on writing a Flickr photo "liberator" this weekend after I recently learned there is no way to download all my original photos in bulk, even as a Pro user.
Signed up for a beta invite, hopefully now I don't have to.
FWIW, a cheap/fast one off way to bulk download all your photos would be to sign up for a free trial SmugMug account, use their Flickr import tool and then do a bulk download from SmugMug.
Using SmugMug's Flickr importer Firefox plugin (no, I don't know why they chose to make it a Firefox plugin), it took less than 2 hours to import ~8100 photos (44 GB) from Flickr to SmugMug and it preserved the metadata I had for the photos.
Definitely not the most elegant way to do it, but if you needed to do it in a pinch it would work.
You may use SocialFolders (http://socialfolders.me) to get a local copy of your Flickr photos (disclosure: I'm a co-founder of SocialFolders, and we plan to support OpenPhoto later this year).
If you're a PRO user you get access to the originals, but not in bulk. You can sign up for a 3 month pro subscription for about $4. Just make sure you have enough space in your Dropbox (if that's what you choose to use).
No reply link to your last question so doing it here.
The ability to change storage providers is probably 2 months out. If you wanted to do it now, I could just reset and delete your account and you could start over and link it from the start. Let me know.
Signed up for a beta invite, hopefully now I don't have to.