So far, only North American Assyrians, born in the middle east have replied here. I must put in my 2 cents worth.
As a kid growing up, I had no team of origin to support at the World Cup (or EURO or ASIA or Copa America, etc). Like everyone else, I would adopt a team. Scotland 1982, France1986, Holland 1990, Brazil 1994, anyone but Brazil in 1998 because their fans were booing Bebeto. 2002, I almost did not watch that World Cup because I was still angry with FIFA over how they handled the Australia/Uruguay play offs, but my mates forced me to watch the opening game and then I was addicted once again.
When I was in Sydney and Italy were playing, My friends and I would go to Club Marconi and support Italy's opposition and get things thrown at us if Italy lost (I loved France's penalty shootout against Italy in 1998). When Brazil played, my mates and I would go down to Rios and watch them among Brazilians, only we would usually support them.
HOWEVER, things have changed. I now have a team to support. My country of birth has had a rebirth of sorts in football. Yes, I support AUSTRALIA. I had always supported them and watched all their qualifiers, flying all over Australia to watch them live, etc, but they never made the world cup, even after coming so close year after year. Because I was born in Australia, it is natural that I support them. It is my team and it is the only country that I have a link to (apart from Japan and Vanuatu where I have lived before).
For immigants to USA or Canada, it may be harder for you guys to follow USA because you don't yet feel a strong enough bond to the USA, or Canada, because like Australia for many years, have done nothing and therefore when it comes to the world cup, everyone supports the country of their origin and Assyrians get left out. I no longer have this issue. My country played in Athens2004, Confedrations Cup 2005, Germany2006, Asia2007, Beijing2008, and alive for South Africa2010. I have a team to support. Assyrians can't support Assyria like Italians can support Italy who live outsde of Italy, or Croatians living in Sydney supporting Croatia, etc. But I have a national team which represents me, that I feel a bond with, so I am one of the lucky ones.
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The idea of an indigenous World Cup, or unrepresented nations World Cup I think would take off. Assyria, Kurdistan, an Aboriginal team from Australia, the Apaches from the USA, there are several African ethnic groups who have no nation. Ashoor, Assyrianvoice.net could sponsor such an event. If "The Other Final" attracted a large TV audience in 2002, then why can't this idea of it is promoted right?