True, but still I think it's best to have the world cup in a single place. There are so many issues that appear when you host it in multiple countries, and also each country has it's own rules, and laws, visas, etc.
And at the end of the day most of the games will be played in the US anyway, so I'm not sure why Canada and Mexico wanted to be there. Maybe Canada wanted to finally be able to host it, but the other two already have done so in the past.
At least to me FIFA is giving a signal to other countries, they are basically saying we are not letting one of the most powerful countries around the world to hold the world cup on their own and they need to have partners to even have a chance to do it, and if any country wants to host the world cup on the future then they need to find partners as well in order to do so, so I think that from now on multiple hosts will become the norm and we will not see a single country hosting the world cup for a very long time.
I think this is the first time that fifa will be hosting in 3 countries, I don't know how this will come out good because I haven't experienced it before. For fifa to make this plan I'm very sure they have good plans for this tournament, let's just watch how it will go. I think people will just choose countries according to where there favorite teams will be playing.