Fossil fuels will not stop being the main power source of the world until atleast 50 years from now. Fusion is the future and its a long way from becoming advanced enough to power us commercially.Useful yes.
Profitable? No
When you have nearly half a trillion barrels competing for a smaller market you can forget making the huge profits of today.
We could use the materials for our own economy but that's only if we have one to start with.
Most oil exporters don't even bother with that and will struggle when the time comes.
Even if Fusion wasn’t incredibly hard, innovation in it is being stifled by the million and one regulations set on nuclear energy.