If they do something special, like "world cup visa team" type of deal, where people would apply for a visa outside of regular reasons and just for the world cup, they got in maybe like at max a few days before the world cup starts and leaves after a few days it ends, that type of special situations? That would be making it so much easier.
The next world cup will attract a lot of visitors, because unlike las world cup, the US is a freer state to have fun in that Qatar was.
Also, with how the MLS is becoming more popular and trending every day in the news since Messi joined them and they have been winning each game, even in the United States, there will be a larger audience that will become interested in the world cup game they know as soccer because of the influence of the big players that have moved to the MLS. There will be a lot of travels for games even by citizens of the country and the government needs to be prepared for it.
It's also a lot more closer to culture of football fans than Qatar was. It's not about having a different culture, or banning some stuff, it's about the fans and what their culture was, and "respect my culture" is not a good way of branding "we will not allow you to do this" because that's just changing words but also doing the same thing.
If you do not allow people to drink beer while watching the game, you lose half of the people already, that's literally one of the most common things everyone does, and just saying "respect my culture" by banning beer drinking, well you end up with white clothed Arabic people watching and no one else coming to visit. They set out to make a good advertisement for their nation and spent 200 billion (doubtful) and managed to ruin their reputation instead.