Yep! Line of sight alone would limit laser countermeasures to the horizon, to say nothing of the air scattering the beam’s energy for the whole distance.
But interceptors (anti-missile missiles) have no such limitation and would remain the only effective countermeasure for hypersonics.
There’s also the issue of laser range, which would probably be not very far, closer to the hypersonic missile last phase of attack range.
Yep! Line of sight alone would limit laser countermeasures to the horizon, to say nothing of the air scattering the beam’s energy for the whole distance.
But interceptors (anti-missile missiles) have no such limitation and would remain the only effective countermeasure for hypersonics.