I just thought of a what if idea..that also touches on the subject of blacksmith/armory revival.
What if when smithy can be destroyed and the bonus of troops disappears with it aswell. Player can rebuild the smithy but the bonus will only be on the level that the smithy is...so player needs to have level 20 smithy to have 20 levels of att or def bonus.
This sound outrageously bad debuff and also 1 building spot gets lost, right...
The catch is that your troops can also receive the bonus of the smithy of another player.
So then all of the attackers need to have smithy to 20 , but only the most important of defended villages high as possible.
This might seem to favor the trend of defensive and laid back style of travian, but it also buffs the active and offensive players to have an edge in attacking players side villages