Well, the "cold fusion" guys are already way ahead of the "hot fusion" crowd, which has had half a century, $250 billion, and has yet to produce a single over-unity device.
And despite your assertions, there have been a number of "demonstrable devices", especially recently, that have demonstrated "over-unity" performance. Celani's is running NOW on the exhibit floor of NIWEEK, and Schwartz's "Nanor" device has been running for months at MIT. And there are others.
I did a Google search for over-unity device, and it spit back all sorts of weird things including the Wiki entry for "perpetual motion." LOL!
Celani claims (unsubstantiated) that he's getting a cool 10 watts of heat after loading his wire for three hours. Sounds like a cure for insomnia to me.
and Schwartz's "Nanor" device has been running for months at MIT.
Nothing more than "Schwartz says," and he's a cold fusion crank who doesn't even know how to set up a URL for his company's website.