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.