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 know about this and how difficult it is to take a visa for other people to America it takes years for normal people to get accepted but since we know there will be millions of visitors going to America for watching the games, I this there will be some special rules for these people, otherwise, none can easily watch the 2026 world cup games in America.