I say bring it on.
They may use drones for aerial mapping at night or in inclement weather, but we are many years away from replacing a fire fighting pilot. The video shows a K-max in daylight, flat terrain, no wind dropping water. Try doing the same on a fire, mid-slope at 9,000 ft with 25kts prevailing wind, with downslope draw and a fire moving at 20kts. NOT gonna happen just yet.