If the advanced drone or UAP is proven real, that someone/something has the capability to travel 28,000mph, hypersonic or even ultra hypersonic, we are doomed. Detection does not matter unless we have weaponry or the ability to reverse engineer and create something that can at least do the same. Hypersonic missiles only go around 15,000 mph.
Ultimately if it is proven real then we are looking like one of those uncontacted amazon tribes launching spears in the air. It would change so much but would also require our top minds to come together to develop something...like another manhattan project, it could bring us all together by how f***ed we are. There are theories that this may actually be going on already.