i've seen Leung Ting taken down by a grappler on You tube but he was relaxed and came out of it very quickly and was back on his feet. I've seen Emin Boztepe hit, but he went on to totally dominate the person who hit him.
No one will ever get so good that they can't be hit or taken to the ground, but I think you stand a much better chance of succeeding by studying a system such as WT/WC that gives you a very broad base for understanding fighting. Granted, BJJ has a better ground game, Fillipino arts have a better weapons game, yada yada, but overall WT/Wc teaches you how to fight and I think overall, you're better off going into a self defense situation knowing what you are going to do because you have spent countless hours training it, than taking the cherry picking approach and doing a little of this from one system and a little of that from another.
No one will ever get so good that they can't be hit or taken to the ground, but I think you stand a much better chance of succeeding by studying a system such as WT/WC that gives you a very broad base for understanding fighting. Granted, BJJ has a better ground game, Fillipino arts have a better weapons game, yada yada, but overall WT/Wc teaches you how to fight and I think overall, you're better off going into a self defense situation knowing what you are going to do because you have spent countless hours training it, than taking the cherry picking approach and doing a little of this from one system and a little of that from another.