I'm all for the idea that it should be impossible for the team to print more DEC out of thin air like they do for the leaderboard rewards. The only way for more DEC to enter the system should be by burning SPS or Burning cards.
As for how it's done and what rewards the DEC should be replaced with I don't have a direct opinion and would need to put more thought into it first.
I think the only thing that doesn't really cause inflation in either cards or tokens would probably be glint/chests. Getting people to agree on what to change them to is likely to be difficult. Looking like they may just stay how they are.