This is why various formats should be allowed. Legacy formats vs standard formats.
Relegating cards to legacy formats has been a thing in CCGs for a very long time. It's a necessary step to keep the card pools from getting too large and removing problematic cards that stifle future card design. Setting cards aside have never killed games. If anything they keep the fresher and better over time.
For example, I pine for a world where Crackle and Implosion do not exist, because they are terribly designed cards. They aren't overpowered and so they shouldn't be nerfed, they just represent poor design. So having them moved into a legacy format makes more sense.
Further, it is already true that cards in your collection that you have crafted become worthless without warning. The game's rising power creep means that as more and more cards are added into the game, eventually cards that used to be considered good will be eventually removed from play and never be used.
For example, did anybody craft Cairne Bloodhoof back in the day? I certainly did. He used to be seen as one of the best legendaries. But Piloted Sky Golem exists now and is essentially a better card all-around so why play him anymore? How about other previously good epics and legendaries that don't see play anymore? Avenging Wrath? Al'Akir? Gorehowl? Faceless Manipulator? These cards have essentially seen a "soft" ban as they either aren't competitive or barely competitive these days. So they don't get used.
from classic packs, the only other playable classic legs I've opened were Al'Akir and Edwin. Gruul, Lorewalker, Nat Page, you name it I've opened several times now lol.
