A few things: 1. REBCO was discovered in the 80s but took decades to work out the kinks in mass production of reliable tapes. 2. Cold fusion is psuedoscience.

A few things: 1. REBCO was discovered in the 80s but took decades to work out the kinks in mass production of reliable tapes. 2. Cold fusion is psuedoscience. These results are real. Speculating that a technology be vaporware is a very different and weaker claim. How do you know that people will not solve the engineering problems preventing mass production? Because it wasn't immediately obvious how to do it in the past?