Indeed, that is what it all comes down to. New money needs to come in in order to hold prices up.
An exosystem where you are sure that your assets will lose value this quickly kills all incentive to put money into it though. Feels like they will start with a high reward pool in the New Season competition with it being another unsustainable race to the bottom as everyone in classic will just dump the cards they earn.

I much rather would have seen a harder threshold and minimum requirements for collections. Now the incentive switched to selling cards instead of players needing to buy more cards.