It's still 20 - 40 years away, just like it has been since the 1950's.
You just can't underestimate the problems of containing a continuously exploding fusion bomb in a tiny electromagnetic containment bubble. The Sun has it easy, as it’s crushing gravity contains it.
Yet, today, America's leaders are reenacting every folly that brought these great powers [Russia, Germany, and Japan] to ruin -- from arrogance and hubris, to assertions of global hegemony, to imperial overstretch, to trumpeting new 'crusades,' to handing out war guarantees to regions and countries where Americans have never fought before. We are piling up the kind of commitments that produced the greatest disasters of the twentieth century.
— Pat Buchanan – A Republic, Not an Empire
