There is hope that the rivers will develop. The places that have great hatches have been as they are now for very long periods of time. Below Beaver, Taney, below Norfork, and below Bull have only been around for a handful of decades.
Norfork and the White below Bull Shoals have Caddis Hatches, Sulpher mayfly, and Hex hatches. Hoppers work May thru October.