Tomahawk is a cruise missile. You mean Tokamak, probably. Well, this Tokamak design is close to energy break-even point by now [they are building the biggest one in Europe, IIRC]. I'd say it IS a progress - and a serious progress, too, as we learn more and more about what will have to be involved. At this rate in 50-80 years one could expect fusion energetics, unless something completely unforeseen and unknown pops up and gums the works.
They weren't that far from the break even point back then, though. That's still light years away from practicality.