Well, it has unfortunately fallen victim to the passage of time and the ever-changing martial arts landscape. While arts like Judo and Sambo have been able to adapt and modernize, shuai jiao has unfortunately not been as successful in doing so. Legitimate instruction has become increasingly difficult to find, and competition circuits have thinned out.
As such, young Chinese martial artists with an knack for grappling have been turning their attention to arts like judo and western wrestling with increasing frequency. The added appeal of these more modernized grappling forms is that the bright lights of the Olympics await truly gifted practitioners.
On the Chinese shuai jiao circuit, no such pinnacle awaits. The choice between shuai jiao and American wrestling, then, is often an easy one. And in the rare case that a young student chooses traditional shuai jiao, their training is often so diluted by the influence of American wrestling that it can hardly be called traditional at all.
This, of course, is not to suggest that pure shuai jiao has completely flat-lined in China. This is an art that has survived thousands of years. It will not disappear easily. Though it is undeniably fading, it still being kept alive by dedicated groups of practitioners, not only in China, but also internationally.
A quick Google search of “shuai jiao” will shine a light on these groups, as you’ll be directed to the websites of dozens of western shuai jiao societies and associations, and schools that claim to teach the art.