[Septimius Severus]

The last team standing must have 3 out of their 4 nations still alive for a team to be declared the winner. That's kind what I was leaning toward. Failing that condition, it would effectively be a draw or stalemate in terms of real team victory.

But if we opt to just say that a team can win with only a single nation intact, well that would work also and may be the inevitable outcome, but it wouldn't encourage cooperation, teamwork and the "we win as a team or we don't win at all attitude" that I'd like us to strive for.

*All* in the stated victory condition just means that all opposing teams must eliminated or forced to concede but not necessarily completely wiped out to the last province. The exception of course is the AI menace team and/or AI controlled nations which will not concede and must be completely wiped out.