There is no question of stagnation in Krishna Consciousness. Krishna is unlimited. The more we advance in Krishna Consciousness, the more we understand about Him. We cannot finish the process of understanding Him. The little more that we advance, we see still that He is far away. Even Krishna couldn't understand His position in relationship to Radharani, therefore, He took the position of Radharani to understand Himself as Sri Caitanya Mahaprabhu.
Letter to Satsvarupa das Maharaja, 21 October, 1975