I don't have an issue with ranged units being dominant relative to melee units later in the game. While I want a balance so that the game encourages the use of multiple types of units, different units are dominant at different points of the game. This reflects historical strengths. In the modern era... ranged units are dominants. Guns beat swords - not because a sword can't beat a gun at melee range but because a run offers range. Indeed, today, for an infantry unit to combat another fortified unit, that infantry unit does so with support from other arms - i.e., combined arms. An infantry battalion that mounts a frontal assault on a machine gun bunker will suffer many casualties. A fortified infantry + ranged unit position should be impervious to attack until the enemy commits other combined arms forces such as armor (tanks) or air (bombers, etc.) The current weakness of the infantry unit reflects historical relative weakness - I see no reason for it to be changed.