MIXED up MARTIAL ARTS
There are many things you need to do to be an effective martial artist. If you are a karate athlete you better know a little about boxing. If you are a boxer you better know a little about wrestling and so on. Welcome to the world of Mixed Martial Arts (MMA) or Mixed up Martial Arts (MMA). The good news is there are schools that will provide cross training under the one roof whilst still maintaining aspects of the chosen martial art.
The point being if you want to be able to handle a variety of street situations or deal with a person of another martial art then do what the plumbers and electricians do because an electrician knows how to change a tap and a plumber knows how to change a light switch. They are in the business of knowing what the other knows and does. As an Instructor this is what I was doing in the ‘90’s when I took up Muay Thai and a number of Jiu Jitsu sessions and seminars which kind of felt weird back then because I thought of it as sacrilege to my karate which I had been training religiously for such a long time. 
But this is not for everyone and there is nothing wrong with just specialising in the one art. These are the people we go to learn from. Master Jean Jacques Machado (one of world’s greatest jiu jitsu athletes) once said to Professor Richard Norton, words to the effect, “People come to me when they want to learn jiu jitsu because that is my specialty.”
Martial Arts are what they are today because of daring to crossing the borders.
GA