What about the trust that was broken with this change when leagues were removed? A gold level deck of CL, RW and Rebellion is much more expensive than a max deck of CL. This change hurt the trust of those players. They were happy investing "wide" instead of "deep". Same for people playing in lower leagues but with GF decks.
Many other changes also "broke trust". So that can't be an argument. Changes are sometimes necessary. This was tried and it's not working.