I don't think there will a "next" Randall, simply because the period in history and circumstances when the Randall knife made it's reputation will never be repeated.
As we all know, the Randall knife made it's reputation in WWII, then during the Korean War and Viet Nam. The close hand to hand combat of those wars is becoming less and less common with the advances in military technology, and with it, the perceived need for a knife like the Randall. Where hand to hand combat was common in those conflicts, it appears to have been nearly non-existent during the first and second Gulf Wars.
The Randall knife also made it's reputation with sportmen after WWII. Particularly those on safari in Africa, pro hunters & guides, and to a lesser extent in the heyday of wilderness Alaskan and Canadian hunting. Unfortunately the classic African safari and extended packtrain North American wilderness hunting is now nearly extinct.
Also remember that in the period when Randall became recognized as the best knife in the world for military and serious hunting use
(1939- early 1960's), America as a whole recognized and acknowledged knives as everyday use tools. Now society views knives first and foremost as dangerous weapons, not everyday tools.
For example, when I went to kindergarten in 1962, every boy carried a clean cotton hanky and a pocketknife (to this day I don't leave the house without a clean hanky and a pocketknife). A kid carries a pocketknife to kindergarten now gets expelled for bringing a dangerous weapon to school.
I'm sure there are knives being made as good as a Randall, but circumstances and the time we live in conspire against them ever equalling Randall's stature. Nope, Bo Randall came up with his first knife at the right time during the right era, and that time will never happen again...