I think the problem it's from Axie Mechanism, People who joining Axie was keep decreasing everytime and it's will creating an inflation as you said so beside doing some burning scheme or increasing the breed the fee Axie team must also creating an new game mechanism that cost SLP same like breeding, It's normal though that on every game there will be point where their native currency will be oversupply so it will be needed some update or anything like that.