In my opinion people are trying to look for a solution without there being a problem.

The big freaks in the heavyweight division aren't even close to taking the division over. On the contrary they routinely get out boxed and beaten up by blown up cruisers.

What giant heavyweights are ruining boxing exactly?

The Klitchsko's are dominating boxing because they are by far the best boxers in the division. They turn up motivated, in shape, they have talent and ability and respect the sport enough to make sure they give 100% inside and outside the ring.

Whether you find them boring or not they are worthy world champions. Surely the fact that the guys given the greatest shot at beating them are also some of the smallest fighters at the weight shows it's not about size.