The easy of training a musketeer had largely eliminated the Bow as a weapon by the end of the 100 years war. The bow was the superior weapon still, but very difficult to learn well. Firearms had also almost completely replaced crossbows as well, at least in large scale application. Like wise the long pole weapons had driven out the hand weapons except the cavalry saber. Simply put a pike has more reach than any person would reasonably challange without ranged weapons himself.
This is of course an oversimplification. Pikes and muskets, or more acurately arquebus's in most cases, were the prefered weapons of the general soldier. Armor and anti armor weapons and methods had fallen by the wayside, since the massed pike itself was so effective against armor, not to mention gunpowder weaapons. This does not mean that other weapons were not used, just that they were not used in significant numbers in battle.
Wallenstein's innovations were largely organizational. He hired mercenaries, and ran their commanders like a staff. He was vicious and vindictive, but also extremely keen in sensing weaknesses and exploiting them. Add that to the fact that he never asked the impossible, and he was able to control his battlefield commanders, without ever going into battle himself. In short he was the first of the great rear echelon generals. One writer called him a military general contractor.
Late in the war a French cavalry commander nemed Turrenne is worth a look. His methods were rather like the confederate army in the American Civil war.