I see that differently for sure. Imagine the hosting countries would fail to qualify for such an event. Do you think that there is a chance that the mood and the atmosphere could be as spectacular when the hosting countries are not even participating? That wouldn't be good and I think the hosting countries should always be auto qualified and at least be able to participate during the group stage. They are putting so much work into organizing that event and if they were than just sit on the sidelines and not play, it would only hurt the event in general.
Doesn't really matter if they have a good mood and atmosphere in their team or not, at the end when they host the world cup they will have many benefits and I think even because of these benefits they can get there will be a good atmosphere for them, just imagine how much money they can earn in this country, obviously they are happy to host the world cup even if their team is not participating.