I cannot stress enough how expensive a world cup boulder is. Not only does it use super expensive holds it also takes up at least 5 x 3.5 m of wall surface where there cannot be any other problems.
Can't the holds be reused? Climbing walls need holds anyway don't they?
I suppose this needn't just be about world cup. It could be a way to have a lower-cost, mass-participation competition -perhaps international. If someone wiped the floor in that, then perhaps they might catch the eye for financial support to take part in the world cup?