Although the "traditional circuit" has greatly shrank both in number of tournaments and number of competitors, they are all "open" tournaments. Mainly attended by independent schools from the original kwans, there are WTF and ITF practitioners that show up. For example, GM Kyonwon Ahn's "classic", GM Ki Whang KIM's Eagle Classic, GM S. Henry Cho's All American Open, GM Il Joo KIM's North American Championships, GM Sok Ho KANG's U.S. Open Martial Arts Championship, GM Joon Pyo Choi's Battle of Columbus, GM C.S. KIM's National All Martial Arts Championship, GM Soon Ho KIM's tournament (Akron, Ohio.. . Can't remember the name of the tournament though) and many others through the years. The above listed competitions were the tournament's that we frequented, some of which are no longer held, and others have significantly changed.
Many Olympic TKD competitors competed at these events, and atleast in the 70's, 80's, and 90's were all traditional "3 point" rule sets. In the late 90's some of these tournaments opened up separate "olympic rulesets" and 3-point rule sets competitions. Atleast for these competitions, most of them allowed all kicks above the waist and punches to the body only (with the exception of the BB divisions, which sometimes allowed punches and backfists to the face).
Like many of said above, no one "style" dominated. It was all about the individual, not about the style.