It's not about allowing a Muslim country to host the world cup, the most important thing is about the country's rules because even some Musil country they have rules everyone should respect, and doesn't matter if they are hosting a world cup or not whether in other Muslim countries, they will expect the visitors from other countries to do not drink alcohol and they take it hard for them.
Its not about Muslim countries becoming the host in FIFA World Cup but also happening to visitor or tourism need to respect all rule have adopted there, if any one ever visitor to Bali they have their rule for the tourism and they should respect exactly when Seclusion day all activities stopping. Its the same with Qatar become the host World Cup and all fans around the world have respect and adapted with Qatar culture without alcohol drinking and most specific Qatar not allowed with LGBT.