Yes, we constantly evolve, but then we are sport based so I don't think we could stop evolving without a lot of effort.
But I don't think every system needs to evolve, which unfortunately many people seem to think they do. And I don't think every system should evolve towards what works in other systems.
There is a place for preserving history, Beethoven's symphany should not really evolve, and the things some of the classical martial arts masters should be preserved as well.
I also believe that different systems have different strengths and weaknesses, and that this is a good thing. We don't need to fill in the blanks, there's that peanut butter theory, on spreading it too thin.
Anyways, imagine all the boxing gyms suddenly realised they where falling short on takedowns, stick fighting and kicks and decided to add them to there training. While they might get better rounded, there punching skills would lessen as time was devoted to other things.
Boxers as it stands, are the top of the chain when it comes to punching, that is all that they do. If the boxers sacrificed there punching to become well rounded the top level of punching overall would decrease.
Specialization is just as important as being well rounded, we need people doing both.
Suppose all the medical doctors started studying astrophysics, computer science, geology and quantum mechanics to be better rounded. Would you prefer the well rounded doctor, or the one that put all that time into medicine?
We need specialists in order to make advances. We need historians to preserve the past, and we need well rounded people to bridge the things the specialists make advances in.
One of my pet peeves with the current state of martial arts is that a lot of people want a club that does everything really well, such a club doesn't exist. Or people do something, toss in a little bit from other arts and claim them as being there.
We can all learn a lot from each other, but we got to stop having pissing matches about who hass the best system, and start looking at what systems has what and what ours is missing. And listening to the specialists from other systems.
When a wrestler says some method of stopping a takedown won't work, well, takedowns are what they do, a system that does a couple takedowns a month and claims it will doesn't have the same level of authority there. It would be like a medical doctor making claims about quantum theory with a guy with a Phd in quantum physics sitting there saying "No, that's not true" And the same goes for the reverse, there is a reason a PHd in physics doesn't let you write perscriptions.