You'd be amazed actually. In the past 30 years they've actually got to the point where the fusion reaction itself is almost at break-even.
That's huge progress. However getting the whole system to break-even requires orders-of-magnitude more energy-returned. Even more importantly is the issue of plasma-stability which has yet to be adequately addressed (seen by some as "The Big Problem") which means that the break-even reaction can't be sustained for more than a fraction of a second.
A guy i write to has been working on fusion research for 15 years. He's in his 40s now and has said "I'm under no illusions about ever seeing commercial fusion in my lifetime." But he firmly believes his work will be of use to a future generation of researchers (which i believe is his motivation - not grants).
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