[myrmidon]

There is zero reason to assume that fusion power will ever be the cheapest source of energy. At the very least, you have to deal with a sizeable vacuum chamber, big magnets to control the plasma and massive neutron flux (turning your fusion plant into radioactive waste over time), none of which is cheap.

I'd say limitless energy from fusion plants is about as likely as e-scooters getting replaced by hoverboards. Maybe next millenium.