I dont like to see so much countries making one World Cup, but also i dont like when the selected country is a non footb all one, or a non so good country to explore/travel. The last one on Qatar was an clear example, the World CUp was made in a very tiny country with not football tradition , and only backed by the power of money.
With the increase on the number of teams I do not think FIFA has too much of a choice, the amount of money needed to organize the tournament has gone up while the logistic issues have scaled up as well, so it seems to me that the right decision was to let more than one country to host the world cup, what it must never happen again is to allow a country or a group of countries to buy the world cup, which is exactly what Qatar and probably Russia did before.
Increasing the number of teams in the world cup means we're going to have more countries and there will be a higher chance for all countries to be in the world cup, this is good because we are going to have a greater community and more people from all over the world can have their teams in this tournament but still, we are going to have the more weak teams we normally could have these teams in the world.