Even if we could open the throat, it wouldn't help. The problems with the upper body tension still remain and are the real problem. The issue is poor body use, bad breathing habits and has little to do with a single biological focal point. If we focus on breathing exercizes that help, on posture that helps and on that big relaxed approach to playing, most of us can improve our playing with little effort. Yoga, Alexander technique or decent martial arts training (not focussed on defeating the evils of mankind) all can increase our body awareness and improve our playing greatly.