The really nice thing about this is that the AI can now acquire these newly-decoded texts as part of its training set, and begin learning at a geometric rate.
Just think of it abstractly. The AI will be trained on the errors the previous generation made. As long as it keeps making new errors each generation, they will tend to multiply.
But. "Our current methods" include reinforcement learning. So long as there's a signal indicating better solutions, performance tends to improve.