I think we need to be careful not to put all (or even most) research funds into something that has not yet been proved practical.The author in the link below thinks we are at least 30 years from having fusion power available on our grid network. I wonder if some of the huge profits companies like Shell and BP have recently had due to the energy price rises could be diverted into fusion power research and perhaps speed up development and bring down that 30 year time horizon to 20 years or even less.
The power of stars to meet our energy needs? This is something to be excited about | Arthur Turrell | The Guardian
Also, imagine that we end up with extremely cheap electricity. I foresee gross "waste" - such as no-one any longer caring about insulation. Heating every room of the house - and the patio - regardless.
The extra release of energy, particularly in cities, could have an appalling impact.