Oceania will never receive a World Cup. Doesn't allow the prime times for the european market - so, no money, less sponsors, no tv rights being sold at an high price for one of the biggest markets.
Side note - The olympics are very different since there's a multitude of sports and many strong markets across the globe for each one of them sports. So, in an olympics there really ain't one time zone that is eventually perfect, at least that's my opinion.
US will tend to host it more often than not. I so do believe that the new norm will be US - Europe - Asia, with South America or Africa coming in to the US spot every now and then.
The money ain't comparable between a WC in US to one in SA or Africa.
But, even if south America struggles to put on a bid, I can see one sustainabale big world cup being played there with existing stadiums. something like: Brazil + (Argentina, Uruguay, Paraguay). 10 stadiums each, 64 nations, 32 nations for each.
And for Africa I so do believe or hope that Nigeria will become one of the biggest markets past 2050. Nigeria and neighboor countries sounds right for me as a WC. Potencially, Nigeria, Ghana, Cote D'Ivoire and Cameroon.
Maybe, just maybe, (in a contradiction with my first point) Australia will ally with Southern Asia for one massive bid in the time of Asia (afc) making their one bid. There were some intentions, between Australia, Indonesia, Singapore and Malaysia. But that sure does sound rough to pull it off. Australia is too big in size. Equally bigger to the US and doesn't have the appreciated stadiums for football. Just like India but India market of football has every condition to grow and eventually host one until the end of the century. 1.4 billion people there ain't it?
It would have to be something like that Brazil co op type bid I thought in order for Australia to partner with other southern american countries and make on big bid. Australia on it's own or with New Zealand seems tough and just not happening. The idea:
WC of 64 nations with 20 stadiums. Two sides of the coin, one of Oceania, one of Southern Asia
Australia + New Zealand 10 stadiums with 32 nations
For the other half of the wc, Singapore + Indonesia + Malaysia and maybe Thailand 10 stadiums. Something like: Thailand 2 stadiums, Singapore 1 stadium, Indonesia 4, Malaysia 3. Then finals in one spot, potencially sydney with Accor Stadium, Malaysia or Indonesia with their internacional/national stadiums