We are a very long way away from having weapons blocking kingdom stars. Currently we recive weapons from raids, invasions, tower of doom, faction and classes. When every kingdom has a class we will probably lose class events and have a new game mode that may give kingdoms more weapons. If a kingdom needs a pay only weapon for stars we could have a new design a weapon contest, a new glory weapon, a new holiday weapon or a new game mode weapon.
This issue is not worth worring about now when we have no idea what is coming in the future. If the time comes and we have to pay for a weapon to upgrade a kingdom then complain then but at the moment lets just be happy we can get old event weapons again.
Probably should have just quoted this instead of writing that out.