Oh, absolutely. If you kept giving it to the same small number of countries who have the infrastructure already in place, then they could definitely host a 48 team one.
I meant, really, with the world cup switching between continents each time, and increasingly looking to take it to different counties more, then it's harder to do that with a 48 team tournament then when they had just just 8, 16, 24 or 32.
It's ever expanding, and looking to take it to ever more new places who all want a go at hosting - but many of those newer places just don't have the infrastructure in place to host the full 48 team tournament. So I'm sure those two reasons combined are why we're seeing so many bids now that are covering more than one country. Sometimes multiple countries. But it just doesn't have the same feel for me when it's being played all over the place compared to when it's just one country hosting it all.
The Euro 2020 (2021) experiment shouldn't be repeated. But this 2030 world cup covering three continents is similar. I get the South American part is just a nod to the centenary so that's a one off. But sharing it between three main hosts, covering two continents, is already overkill again for me. There's clearly just too many countries all wanting a piece of the hosting action and they're looking at ways to include more and more. But as usual when that's the case, too many is just diluting it for me.