Adding some kind of geographic or classification limitation on the address
would defeat the point of friendly addresses, as the public wouldn't understand the
system.
Are you seriously saying that adding .food.us would confuse the public?
That
is a very superior attitude to take.
It would take just a little publicity to clue
them in.
With name.class.reg.country or name.class.country.reg there will be NO
conflicting marks, even in International Multilingual Internet.