I agree that single city realms shouldn't be able to last forever. Granted, Oligarch is one of the richest cities, but that it can hold out almost forever against Sirion is a bit odd as well. But with the proposed numbers you give, it'd be dead in one siege. On the other hand, smaller realms than Sirion currently can't siege a city at all, which is an even greater problem.
Yeah. Unless numbers become low enough, no one can siege anything. Sadly Sirion and Oligarch case is an outlier compare to all other cases. There are not that many realms with over 40 nobles or a city that can generate as much gold as Oligarch to allow them to hold out indefinitely.
You can't have a case where one region realm can survive forever against a giant. That just doesn't make any logical sense. If even a giant can't besiege a city then who can?
If we don't want to reduce militia numbers too much, we will have to make SEs more powerful and abundant so they can bring down walls even faster. We might as well lower all city walls to lv3 since lv5 is practically impenetrable. And will have to reduce militia's strength by 50% so while they still maintain their number, they become a lot weaker.
