As I see it, the Cheung-Boztepe fight was a good example of what a realistic fight will look like regardless of the "styles" of the combatants. A MMA/NHB fight, the "lunch break at school", the after-school fight, the bar fight, Cheung-Boztepe, etc. will all look pretty much the same for the simple reason that when people really go at it full-out, all the sytlistic, nonfunctional, artful, etc. crap goes out the window, and all anyone can really make work are the same basic functional elements (because our bodies can only do a limited number of things at 100%. That's why I think that the further a person gets away from this - in other words, the less your martial art "looks" like this - the less effective it will be.
On a related note, Matt Larson, the man considered to be the "father of Modern Army Combatives" (the system of hand-to-hand combat taught to the U.S. Rangers and special forces), reported that hundreds of soldiers that engaged in hand-to-hand combat in Afghanistan and Iraq were interviewed, and, according to Mr. Larson "every hand-to-hand fight we have documented has involved grappling, but not a single one has involved only striking." (quote from "Hand to Hand Combat" by Greg Thompson and Kid Peligro).