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.
Yeah, I have totally stopped paying attention to the new abilities. I hate the corrosive fog ruleset. It seems like every new card has its own new ability now and almost none of them are intuitive or simple. They all take 20 words of more to explain them and even then I'm left scratching my head. Rebellion is trash. When they got to cards removing abilities from other cards I just turned off completely. Actually stealing abilities has made it so nothing matters in the game at all anymore. I'm just thankful that I still almost never run into many rebellion cards.