To tell you the truth, I never came to a point where I felt I was at the end of a technique's potential.
At a certain moment, the technique might naturally "dissolve itself" though, because you reach a state of unity, inner peace or absolute awareness.
When this happens, you can let go of the technique and abide in this new state.
When this happens, it feels like the spirit "takes over". You feel like you are there.
Of course, you can come back to the technique if you feel like you loose focus again,
Remember that a technique is only a key, it is not the goal :)
To your Yoga!