How would EmDrive cut the cost of launches? It doesn't have the specific impulse needed to escape Earth's gravity well. That would be like trying to launch from ground to orbit using a hall effect thruster. I'd also like to nitpick the "does not use fuel" claim, or the phrase "simply requires initial power".
The EmDrive is basically a solid state electrical propulsion device, just very exotic and as such absolutely requires ongoing input of electrical current, probably from an onboard nuclear reactor if we hope to get useful thrust from the thing and fly a vessel propelled by it beyond the useful range of solar panels (anywhere beyond Mars orbit).