I hate to quote this stance and by (correct) inference share it, but here I am.
The other danger here is that glorifying dubious shortcuts like Cannae Drive takes away attention (and, potentially, political support and funding) from the real space-exploration advances. You know, the ones that result from the hard work of large teams, not the tinkering of lone inventors. When the results of the Cannae Drive prove impossible to validate (as will almost surely happen), it may produce an unjustified cynicism about how NASA has failed us once again. I’m not just speculating here. In a whiplash pivot, the same Popular Mechanics story that starts with the breathless headline ends with a sneer. The writer concludes, “But I’m still wondering, how much did it cost to run this test? During this era of tight budgets, is NASA wasting money on fringe science?”
I want this to work, but I don't believe it. The notion of extracting energy out of the quantum foam sounds particularly impossible to me.