The fact remains, that until Philip, the phalanx was not only the arm of decision in Greek warfare, it was practically the only arm. The phalanx was an excellent tactical innovation, but one tactical innovation does not a military system make. Beyond lacking a leader as talented and ambitious as Alexander himself (yes, a Greek, I'll not argue that), one of the reasons that the Greeks didn't conquer even a small portion of the Persian Empire is that the phalanx was, essentially, an excellent weapon, as attested to by the Persian habit of employing hoplite mercenaries (more parallells to the Swiss), but it was not a system that could adapt to myriad situational challenges or that could meet the logistical challenges of maintaining offensive operations beyond the next planting or harvesting season in lands far from the army's recruiting base.