After losing a planet to the AI, I was thinking how hard and depressing it can be to come back after losing a colony or two.

What do you think about not losing fleet supply immediatly after losing a colony.
There would be a grace period to represent your colony selling war bonds and
trying that much harder to get that colony back?

Or even taking it a little further, you would get a slight increase for a small
period of time to represent your colonists working that much harder.

Maybe fleet supply never goes down, to represent the logistics you have learned. Fleet supply can only go up.

Or to prevent someone from having too many ships and not many planets to defend, you lose some fleet supply that was provided by the planets you lost, but not all of it.

I'm just trying to think of a way to help you come back after taking heavy loses.