Wuxia fiction, by definition, is not reality. Nevertheless, many of the stories, especially Jin Yong's, occur in a fictional universe that very closely parallels reality. They are not complete works of fantasy like LORD OF THE RINGS or STAR WARS. DGSD took place during the Northern Sung Dynasty, LOCH/ROCH took place during the Southern Sung Dynasty, HSDS took place during the Yuan Dynasty, etc. Fictional characters interacted regularly with historical persons, and occassionally even took part in significant historical events.
If that's the case, then logically, in the wuxia universe, time eventually reaches the modern era...the 21st Century. What would the 21st Century be like in a world that actually had individuals like Kiu Fung, Gwok Jing, Yeung Gor, Cheung Mo Gei, and their incredible martial arts skills in its past? In *that* 21st Century, could any of those martial arts skills still be in existence?