That's not very long. The first liquid-fueled rocket was in 1914, and the moon landing wasn't until 1969, and even that was only possible with very high levels of funding far beyond what's invested in fusion power today. Babbage built the Difference Engine in 1822 and conceived of the Analytic Engine in 1837, leaving skeptics dismissing the potential of computers for 150 years. Leonardo da Vinci sketched a helicopter in 1480, almost 500 years before one could actually be constructed. Gunpowder was invented probably before the year 1000 and took over 700 years after that to render pikes obsolete.

Now, it's entirely possible that there's some other limitation holding us back from fusion, just as the lack of internal combustion engines or diodes held us back from helicopters or computers. But I think we've done enough work so far that we'd be able to tell if we were running into something like that. As it stands, I think we're roughly in the place rocketry was before WWII--we have an idea of how to do it, and we don't know if it'll go to the Moon or not, but the only way to find out for sure is to try, and that's pretty expensive and might take awhile.