We'll see, but my paltry 5 years of Nuclear Engineering training
is severely balking at the physics and the engineering.
What's the old saying? There's always something new under the sun? Appropriate in this case.
Even if sonoluminescence isn't fusion it's still a very interesting phnomenon worthy of research.
Is there a different purported mechanism for the cavitation fusion than hot fusion, or is the idea that the density is so much greater as the bubble collapses, that even with a vanishingly small reaction cross section, you have so many collisions that you get appreciable output?