Jazz fusion has been around about as long and has been far more commercially viable

Like Weather Report? Sure, they sold some records. Not so much anymore.

It was ten years away for most of the last 50 years, but recently it has become 5 years away. So, in a strange way, we do seem to be making progress.

We've been successfully fusing hydrogen into helium since Philo Farnswith invented his Fusor.

Re: addendum. Isn't cold fusion even farther away?