For the most part, I think that you are basically correct and that there has been relatively little evolution in the big picture of unarmed combat. Most style evolution is a result of encountering fighters who's style is radically different or who's body types are radically different (western Europeans are generally markedly taller and heavier than east Asians, for example), and training to either incorporate newer techniques or to account for new situations. But I see this as more of a stylistic and surface phenomenon than anything else, and at this point in time, evolution of styles is more the result of changes in competitive rules and the emergence of new competitive venues rather than being the result of meaningful changes in the nature of unarmed altercations.and why would you say they " had to 'evolve' in the 21'st century"? Please elucidate!
I was not aware that we have changed internal anatomy, or grown an extra limb, or lost one. I was not aware that no one could came into physical combat range ever now...
so Please explain to me how a fight today is any different then say one in ohh 1910 AD, or say 800 AD, or 15,000 BC?? when its for keeps is that fight any different? is the man any different?
At this point in time, I think that I am safe in saying that any meaningful evolution of combat between unarmed opponents is at a point of completion. Instruction of unarmed combat may evolve as people experiment with different teaching methods or to account for changes in self defense law, but in terms of evolving how to strike and grapple, there really isn't anything new under the sun.
Daniel