I do not agree with you about the factors and comparing Qatar with America, we know getting a visa to enter the USA is more complicated, especially for people from some countries with a bad reputation and bad relations with the USA but I think America will make an exception and some special rules for the people who come to visit this country for watching the worth cup games. That's why I don't think if there will be a problem with getting a visa.
As I mentioned in one of my previous posts, USA is one of those countries which favor illegal immigrants over legal immigrants. If you apply for a legal visa, you need to wait for 3-4 years to get a hearing. An easier route is to travel to Mexico and then jump the fence over Mexico-US border. Every year millions of illegal immigrants take this step. Now I don't know whether the Americans will ease visa rules for the FIFA World Cup of 2026. If they don't do so, then I don't expect a large attendance from third world nations such as India and Indonesia.
I think special rules will be made to make it easier for football fans to watch live games in the US, and they usually are. The number of football lovers who come from every country is inconceivable and it will be such a loss if they don't relax every rule regarding tourists visiting their country for the purpose of watching a World Cup match. Surely the government will see this as a kind of business.
When comparing one country to another, I think it will be endless because each country has its own regulations, and they cannot be contested unless the government of the country concerned issues a new policy.