It doesn't have playing numbers throughout the world, there are not many countries with viable competitions (if at all) but there is no reason why rugby league cannot stage a credible World Cup.
There are many with an opinion that it's a waste of time and just a tournament filled with Australians, Polynesians and New Zealanders. So what? There have been some very good games and despite scorelines blowing out, those same games have been extremely competitive and entertaining.
It is the countries represented that matters, not who is in the teams. There seems to be a policy of slating rugby league by individuals who have not got much to talk about and the need to fill some space. We complain because there is not enough competition on the international stage and then, when it is provided it in bulk, there is nothing but ridicule.
Yes, there will always be the big three teams in the semifinal, but many sports have a similarly clear forecast of their World Cup finals. The sport is limited in resources to expand like others and the reasons are confined within the boundaries of two states of Australia (that's another topic) - but accept the competition for what it is: an entertaining package with the hope your team progresses further.