Can we throw away this idea that a timed burn somehow gives us the correct supply for the game? Burn or not, the market had the ability to decide how many Chaos Legion packs it wanted to buy too. Did we end up with the right number for the game?
12.5 million Chaos Legion packs were sold in one year. That had nothing to do with the need for cards in game and everything to do with hype and special incentives to overbuy.
If this is hyped up with incentives that have everything to do with selling as many packs as possible but nothing at all to do the need for cards in-game, we could still get a massive oversupply of cards in the game before a single pack is burned.
Don't play games with the supply. Just limit it to a reasonable number of packs for the player base we have. Or create even bigger incentives to burn excess cards than you do to buy them.