I think if they want to increase the slots for this world cup they need to increase the Eorioan team's numbers more than other teams because, in any world cup, we see there are many European top teams that can't get qualified because there are not enough slots for them which can be a reason to say the increasing number of European teams can even increase the quality of the world cup.
I think there is already enough advantage, just keep it increasing like that would be fine. As long as we have more teams, I am pretty sure lower level European teams will not make a big impact, it would be cool to see more teams period, don't matter where they come from.
Sure if you make it European then you are going to get a lot better teams, but we already have good teams at the top, the aim is not to get just good teams, we have enough of that, there are only a few teams who end up winning most of the time anyway, getting Estonia or Slovenia will not change that at all. The point is to get more nations, meaning more population, meaning more money. That happens when you are global and not just one continent.