I would say for the purposes of keeping up technologically, the republic is necessary. All of our towns should be cities soon if they aren't already, so we should at least be able to support 15 units relatively soon. And since we will have the full array of improvements in all of our cities, with little corruption, we should still be fairly powerful research wise as a republic. Of course, I may have underestimated our eventual unit support costs. Oh, got it, but I'll wait until there is some more input on government before playing.