This needs to be put into perspective. Serving alcohol in the stadiums is only a tiny tiny tiny part of the fifa cash cow that is the world cup. Revenues from sales are relatively small, especially in instances of fairly low attendance (i.e. the the 2022 world cup). The vast, vast majority is TV rights and advertising rights. So the issue of alcohol in the stadiums is really about the enjoyment of the fans on the scene, and, let's face it, when they selected Qatar, they did not have the fans in mind.

My guess is they will end up with something akin to American college football--a multibillion dollar industry that makes most of its money from TV rights and ads in the televised games. The players and student fans are mostly too young to drink and so alcohol is not allowed in the stadiums. This does not prevent massive beer ad campaigns during commercial breaks that target fans at home (students also routinely show up to the games have drunk quite a bit beforehand). What I do know is that economic reasons will not weigh very heavily into whether or not fans can have a cold one in the searing heat of the 2022 world cup, because the actual serving of it is not the main reason why brewers become sponsors.