So, they just need to drill down far enough to get to the point where it is hot enough. About 3 miles.
As soon as they get just one of these things to work, oil futures will take a major hit.
I put their chances at success at about 1%. Big payoff if they really do hit. Like in poker, table odds versus hand odds. Table odds are $1Billion to chase $1Trillion [1000:1], hand odds appear to be 100:1. Worth it.
The big trick is to keep the drilling equipment and heat processing equipment from melting .... doubt that the hardest steel or alloys can stand million degree heat.