I guess everyone would love to see more countries in BB, but we don't want more empty countries. There are however changes required for national team tournaments, allocating schedules, etc. that involve work. This keeps new countries to a minimum unless a country is expected to get a healthy number of users. The African countries are not at a very healthy level of users at the moment.
Regarding national teams and Angola, they already have made their mark on BB:
(http://www.buzzerbeater.com/community/rules.aspx?nav=Nati...). Perhaps more will follow!