Sure! If he was young!
Good Ol' Bruce was the father of MMA(Mixed Martial Arts), combining Boxing, Wrestling, Wing Tsun, TKD and many different arts.
His main philosophy was to adapt and dont have any set style, use what is useful! Early he broke out of the traditional thinking of martial arts, using whatever was available.
Eyejabs, knees, elbows, grappling etc
He was ahead of his time and if he was 25-30 now, im sure he would do well in his weightclass in for example Shooto in Japan.
Remember though, Martial Arts have evolved a lot during the years from 70's to now.
Back in Bruce's day, his philosophy about mixing martial arts was revolutionizing, now it is mainstream!
Training is very different now, to be successful in MMA contests, striking is not so important now as it was in the 70's.
Much more cardio and strength-training as well.