This article is out of date. The big recent change is higher temperature superconducting. That enables the plasma-containing magnets to be smaller and less energy-consuming. People at MIT and elsewhere expect continuous operation with positive net power in two years. That’s why we’ve now got venture funded startups in fusion. ITER is by definition much older technology because of the logistics of its construction. It remains as a testbed for commercialization, but it’s no indication of the state of technology.