Why not explore this? The worst that could happen is that they are right and it's a dead end. Alternatively, if it works, physics has new areas to explore, new theories to deal with.
We can go beyond Einstein, eventually.
There is always Cold Fusion to perfect.
Especially since Hot Fusion remains 20 years out.
We are already beyond Einstein.
QM.
Quantum Entanglement.
The Tunnel Effect.
And more.
John Bell proved that Either Einstein’s local universe theory was correct or Quantum logic was correct, then he proved that indeed, Quantum Logic was correct.