[jandrewrogers]

It won't work.

Most hypersonic weapons already require ablative materials to transit the atmosphere without disintegrating. Ablative shielding is the norm. Even then, a lot of engineering goes into ensuring that ablative loading is carefully controlled during flight -- any significant deviation from the designed ablative loading will cause catastrophic failure. It took decades of research to get to the point where a (non-ballistic) hypersonic missile under normal flight conditions could reliably manage the ablative loading long enough to reach its target. They are literally testing the theoretical limits of material physics.

Massively increasing the external thermal loading of those materials during flight is a great way to kill a hypersonic vehicle. It directly attacks one of their most vulnerable design constraints.