Currently after wars the AI's planets are often weak economically. The reason for this is they have so low population on their planets due to conquest ie remnants of the troop transport population living on the world or the last survivors of an invasion.
What i'd like to see is when an AI is at peace it will ferry population from it's larger population worlds eg 5 billion plus to the lower pop worlds eg 800million or less.
These worlds can take an eternity to recover population and need serious help the max pop growth per turn doesn't start until there are about 2.5 billion on a planet. There is a huge difference in how much money you make from a planet each turn dependant on how big its population is.
The Korath are the biggest losers because of this due to there spore ship. Once invaded a spore planet will only have 5 million people to get to the magic 2.5 billion mark takes it an eternity (many years of gamplay (I haven't done the math but it's a long time). This means having a lot of very economic poor planets for a long time (not a good idea).
Don't know how long this will take to program but i feel it is highly needed and should be introduced in DA.