The biggest problem with BBing as an Olympic sport is that it is judged completely subjective to the opinions and ideals of the panel. How do you define 'too big'. How do you define 'perfect proportions'.
You can't define so many of those things. Two people of different heights with different sized and shaped joints will have two different ideal masses for their frame, two different sets of proportions.
I would LOVE to see BBing resume its place of glory from 30/40 years ago. But I doubt we will ever see it in a competitive Olympic arena.