The thing is though, a hypersonic can't really hide the massive hest signature it generates. To defeat that you'd just end up with an entirely different kind of

The thing is though, a hypersonic can't really hide the massive hest signature it generates. To defeat that you'd just end up with an entirely different kind of missile (either having the missile go up into space, at which point it's an ICBM, or having it go slower, which turns it back into a regular cruise missile). So either way, the system specifically stated as tracking hypersonics, has technically not been defeated at its job.