I'd argue that it doesn't work well in the piece. Every other motif and phrase in the song is definitive, clearly ending on the final beat of the bar, but for whatever reason Tarrega left that one motif, and only that motif in the whole piece, to trail off into nothing. It just seems a strange decision in my mind, and rather frustrating to listen to, despite it otherwise being a rather wonderful piece of guitar music.

Ah well, horses for courses and all that!