I totally agree with the "market correction" sort of take on this. Simple economics at play here in many respects and I think, on the whole, this is healthy for the game and allows for a lower cost entry point for those looking to own some cards.
I do think that if there is something from a battle format perspective which negatively impacts value of older cards too substantially, it would be a big miss. There is some big money behind those collections and the people who own them and while correction/stabilization is good, too much will prove to be detrimental. As was suggested, higher rewards for the format(s) utilizing older, more expensive cards makes total sense.
I agree that this is healthy for the game. For new players the most important is the new rewards cards, but cheap common and rare chaos legion cards will be great for them as well.
I’m really curious what will happen when you can buy packs with $2 worth of dec tokens. So if dec goes to $1, then you pay 2dec for a pack. (I don’t think this will happen anytime soon)
Also how close will it get back to the peg when chaos legion launches. In an ama it was said that they would not mind if dec would become $0.01 instead of the original soft peg at $0.001