Apart from devaluing old assets the biggest problem is that the game itself has become way to complex and complicated to attract these new players the team would like to join!

100% on this, the moment it became too complicated and too much for me was the introduction of the Corrosive Fog Game rule & the Corrosive Ward ability. I didn't even bother to read the newly introduced abilities but doing so now really made me go whatt ???

"Permanently gain +1 ranged power for each allied 0 mana card from the Chaos Legion set"

This literally is trying to fix the economy (chaos legion 0-mana cards) by making the game more complicated sacrificing gameplay and fun while printing more assets.