There's lots of difficulties that have to be overcome through engineering, goes without saying, but they can be overcome. It isn't just about "green" for me, though the non-combustive is green. It just happens to be the logical conclusion (economically speaking).
Fusion will likely overtake the centralized grid. At what point do you feel comfortable paying for a fusive energy, which will come, when that doesn't belong to any company and is by its "nature" not that which is subject to supply/demand metrics? There would be an infinite supply of the energy at that point, and a non-infinite demand. What should the price be? Free? But will it? That's just fusion but there's a reason, too, I look beyond it.
And the governments, through universities and taxpayer monies, not corporations (for the most part) have paid for it. It would be a scandal if this was given over to any energy company.
It's worth considering just how enormous the shift is here. Supply/demand is pivotal to all economics. Here it doesn't really exist. You cannot price something higher due to inflation, with fusion, whenever it is available, because it will always be available and in a quantity which is infinite. That's almost the death of capitalism (traditional) by itself. An economy is just energy, really; and this is "just" fusion -- there will be more on the way.