I hear reports that a race may have complete space control for decades on an enemy planet, yet simply be unable to do anything whatsoever on the ground.
I propose that when a planet is continuously sieged for an extraordinary amount of time (for example, 10 years) stacking penalties on the planet start occurring. In traditional warfare, the major goal of a siege was to degrade the ability of the defenders through isolation. This isolation lead to an eventual lack of supplies, which in turn lead to degrading conditions until an eventual surrender. I don't know exactly how this occurs in TLF aside from ground bombardment, but I feel like more can be done.
Now how simple or complex this occurs can very a lot. For example, after an extended siege the following things can occur (not all of them, just example)...
RCI values start dropping
Birthrates fall under natural rate, either stopping eventually at zero or even under (accelerated death rate)
Ground power drops
Static defenses degrade
Now sieging a planet is a lot harder then sieging something small, which is way the time it starts must be over an unusally long amount of time and the effects must start small. It is meant to be stalemate breaker.
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Now, if the above is considered interesting, then it could get a lot more depth fast. For example, if under siege, the defender might start employing smugglers to reduce or prevent the effects of siege. The player could either aid or hinder this smuggling. Various races could naturally be more resistant to a siege, while some races may or may not be inclined to use sieging at all.
Anyway, before I mantis anything I wanted to hear other opinions of a mechanic to prevent stalled assaults where it is clear the attacker has almost complete dominance.