Some other aspects of changing demographics: The average age of fans who attend Worldcon is older now. They tend to have good jobs and can afford to travel. (In the early days most fans had very little money.)
Some North American fans worked hard to build stronger connections with fans around the rest of the world, with the idea it would lead to more overseas Worldcons. For example, LA fan Milt Stevens served in the Navy and made friends with Japanese fans when his ship called in Yokohama. LASFS started the tradition of including the Seiun Awards in the Hugo Awards ceremony. Later, Washington, DC fan Peggy Rae Pavlat organized an effective North American campaign on behalf of the Nippon 2007 bid.
For the fans who regularly work on Worldcons, site selection is about voting for where they want to work on a Worldcon and who they want to work with. Getting to know fans from other countries by working with them, at their Worldcon, in their country, can be a life changing experience. You want to do it again.
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Some North American fans worked hard to build stronger connections with fans around the rest of the world, with the idea it would lead to more overseas Worldcons. For example, LA fan Milt Stevens served in the Navy and made friends with Japanese fans when his ship called in Yokohama. LASFS started the tradition of including the Seiun Awards in the Hugo Awards ceremony. Later, Washington, DC fan Peggy Rae Pavlat organized an effective North American campaign on behalf of the Nippon 2007 bid.
For the fans who regularly work on Worldcons, site selection is about voting for where they want to work on a Worldcon and who they want to work with. Getting to know fans from other countries by working with them, at their Worldcon, in their country, can be a life changing experience. You want to do it again.