Wasn't the point of hypersonic missiles being that they are so fast, and can make small course changes that make intercepts impossible due to the time between it happening and when an interceptor reacts?
I'm not saying in actual use it's reliable, but then again that's true of every country's ICBC interception capabilities. Missile guidance tech is one of the things the USA has an edge in.
They will likely come up with some no-bid sweetheart deal between numerous military-industrial complex grifters and make silly shit that can't operate in the rain or that requires a new paint job every time it's turned on.
Seems like a bit of a stretch if you're having trouble developing a normal hypersonic missle. Presumably, you'd need to make something faster and more agile.