What if the game ended the diamond level and made champion 6 levels, combining it all to a mega level max level league? Much more match liquidity at higher levels and you could play anyone in champion level and would incentivize people to become champion level decks but not "piker level" or minimal level champion accounts to have any substantial chance for earnings. 55% of the game earnings per match would go to max level decks, the other 45% to level 1 up to about 60% levelled up cards under that current proposal.
Based on current abuse if they cut bronze and silver by a factor 3 (or 1/3) and they earned 3 and 5% and then distributed the difference to make gold more highly compensated and a bit more to champion, making it much more lucrative to level up, assuming match spamming/abuse is reformed.
Long story short this is new proposal is definitely on the right track addressing in game comp abuses in a major way but is less than perfect imho.