I have my doubts about one technique per year. What happens when uke isn't right, or you miss a grab, or something similar. Knowing how ikkyo can be turned to nikyo or sankyo, for example, can be the difference between completing the technique successfully and looking like the klutz I normally am.
I think once you are reasonably competent and familiar with all the techniques, polishing one technique per year might be beneficial. For beginners, I think the ones who didn't die of boredom would have some awfully stiff technique.