The problem with fusion under current technology is the scale on which you have to generate power for it to make economic sense.

The marginal cost of each additional watt beyond the first is practically zero, but the cost of GETTING to the point where you can generate that first kilowatt means you'd have to have a power plant in Atlanta supplying power to the entire southeastern continental US. And another power plant in Nevada supplying power to just about everything in the western half of the country. And so on. The problem is, random things like terrorism (blowing up power transmission lines), storms (blowing down power transmission lines). and the need to occasionally do maintenance make putting all of your eggs in literally that one basket absolutely SUICIDAL.

In order to achieve high availability (since the consequences of any outage would be almost continental in scale), you'd have to maintain a parallel network of conventional power plants and keep it on permanent standby... which would basically soak up any potential cost savings.

Any power technology that depends upon having a service market area of 50 million customers just to break even on the startup & fixed costs (let alone be profitable) is doomed. Even with government subsidies, no private company would EVER invest capital on the scale required to make fusion power profitable. In China, it might be viable since there are a few areas that literally have 50 million or more people living within 100 miles, and China as a whole is big enough to afford building an extra plant or two to have wiggle room for taking one plant offline (intentionally or otherwise). The US or Europe? Not a chance.