League of Legends Classic Mode

Was watching an old video, and I don't know how hard it would be to pull off, but I wondered if Riot could have either a Classic Mode, or maybe a Classic week or something of the sorts. Where you get to re-experience all of the old champions, like AP Trist, Soraka Mid, AP Yi, so forth and so forth. Also seeing old jax with dodge runes would be rather hilarious. It was always fun and entertaining to see a champion be played where it was not meant to be. Being a Pre-Season 1 player I have definitely seen a lot of champs play styles come and go. It would be fun to see them reappear for a little while. Especially mid Soraka, that was by far my favorite.