Dont think it can be done right now.
First off there isnt a really amazingly compelling fighter out there who can write their own ticket under the age of 30.So the promoters still hold a position of"I can make you,or I can break you"
Secondly there isnt a unniversaly recognized title,that could force challenges and force promoters to make deals with the fighters.Rather then one promoter,just working it out with another behind closed doors. As long as the WBC is riding in Don Kings hip pocket,dont expect that to change any time soon