I get asked about the process of building excellent technique quite often, and I wanted to give a couple of thoughts.
Think of your swings like your garden. When will you need to stop mowing it? Or planting new seeds? Or trimming the hedges? It is a continual process, and it takes time, conscious effort, and a strong picture that you are working towards.
Your technique is only as good as your transportation system to the ball. One of the reasons Nadal would make me look like a clown right now has nothing to do with my technique, and everything to do with how far away from the ball he would get me, meaning that i would have to rely on more and more improvisation, and less and less accuracy and placement. The only way i could hope to compete with him, would be to go up into the mountains and train for two years on my footwork and movement, and my relationship to the ball before I swing.
So in summary: In order to have good technique and good choices of what do to with your next shot, you need immaculate footwork, the two go hand in hand.