Maintaining high levels of security will be a challenge. But then, the world cup was held previously in countries such as South Africa and Brazil without any major issues. Even then, hosting the tournament in Nigeria or some of the other African countries will pose a big challenge. Once in a while, FIFA may allow countries such as Nigeria to host the events. But then, they should not ignore deserving nations such as China and Japan, just because they are not poor. Despite being the most populous country, China has never hosted the FIFA world cup. This is not fair.
Current president of FIFA, Gianni Infantino, claimed that organization will set record in profit during 2022-2026 period due to increase of number of team that participate in FIFA World Cup 2026 and the size of North-American market.
I think this is the reason why China never hosted FIFA World Cup - it is unprofitable for FIFA to run cup there. Even though China has everything - infrastructure, football is popular there. But it is all about money.
Or there are fewer football federations in China or Asia in general, to have enough votes to vote for China when they choose who will host next World Cup.