Offer a Championship Match with "Allies=1"
Since a large majority of us play Planets where we are allowed 1 ally, why not try a Championship Match that emulates our most common format? Have the winning two players crowned Emperor and Co-Emperor, while awarding the player with the most planets the added advantage of creating his new ship. This, I think, would lessen the back-stabbing and add to the general enjoyment we all receive when teaming with another player.
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Whisperer commented
I believe that would be a suboptimal solution. A better solution would be to have more "Allies=0" games available.
The Emperor is supposed to clearly demonstrate their ability to conquer all other players in the field. The title would be diluted if a game could be won by an alliance.