The reason I'm saying this because people can still play nicely with cheap chaos legion cards. Although the users of old legions definitely have advantage over them but this doesn't limit the usefulness of chaos legion. Slowly the cards with high utility will go high in price while with lesser utility will put those old not so good cards back to low value maybe even lower than chaos legion. This will how things get balanced over time. So that's my pred about going old cards prices lower but not much because of limited number.