I agree with Ron (MSUTKD). The sport aspect of any Martial Art, including Taekwondo, will travel its own path. Instructors who focus on the complete art of physical, mental and spiritual improvement, along with effective self defense tactics, will do fine in the same world.
I believe we can do both if we choose. Think of all the combat skills throughout the history of the world that have also been played out in games. Many times, this is to the benefit of the soldiers who sharpened, and honed their skills between battles. Bows and arrows have been weapons of armies in the past, yet archery contests never hurt that art. Only if a person would shoot stationary targets at 10 yards, and think they can hit a live target in battle would they be misled. Knights who jousted on horseback improved their skills for combat, and the better warrior usually won.
In the end? There is no end! It will continue on as long as man (male and female) has the desire to learn the true ways of the Martial Art, while also enjoying some entertainment, physical activity, and skill challenges of sports. Some will do mostly sports, some will do no sports, while others will maintain a healthy balance of both.
That's the way I see it.
CM D. J. Eisenhart